21 10 264 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/807cc48ab93cd8cad76b2bb06a578b0a.jpg 6aac8ea3562c60bfeff5bb94c7f347ff Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2>Halite</h2> Subject The topic of the resource <span>This mineral is commonly known as rock salt.</span> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text"> <p>NaCl</p> </div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Non-silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>cubic</p> </div> </div> <div class="element"> <h3>Physical Properties</h3> <div class="element-text"> <p><em>Colour in hand specimen:</em><span> </span>colourless or white when pure, more typically orange or red due to inclusions of iron compounds, and may also be grey, yellow or blue<span> </span><br class="NoSpacing" /><em><span>Cleavage:</span></em><span> perfect cubic, three planes intersect at 90°</span><span> </span><br class="NoSpacing" /><em><span>Hardness:</span></em><span> 2.5</span></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">halite</div> </div> cubic evaporite https://wserv3.esc.cam.ac.uk/p1acollections/files/original/843d5e0446ec9d2c4295db1f6c0a4ee8.jpg 81b2ce4c0a05b83ee042387c2c152222 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/86cff81081acbf0eac740be4157e010f.jpg 74ab1618aaec0ee5b25910722f62cc76 Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2>Fluorite</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text">CaF₂</div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Non-silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>cubic</p> </div> </div> <div class="element"> <h3>Physical Properties</h3> <div class="element-text"> <p><em>Colour in hand specimen:</em><span> </span>extremely variable: colourless, white, yellow, green, blue and purple most common<br /><em>Cleavage:</em><span> </span>perfect octahedral, up to four visible at one time, breaks into dipyramids<br /><em>Hardness:</em><span> </span>4</p> </div> </div> <div class="element"> <h3>Optical Properties</h3> <div class="element-text"> <p><em>Colour in plane polarised light:</em><span> </span>colourless, pale green or pale violet<br /><em>Pleochroism:</em><span> </span>none<br /><em>Relief:</em><span> </span>low</p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p class="NoSpacing"><strong><span>M560 Fluorite</span></strong><span> </span><br class="NoSpacing" /><strong>Derbyshire</strong><strong><span> </span></strong><br class="NoSpacing" />Cubic fluorite crystals<span> </span><br class="NoSpacing" />Generally very variable; in this case white to purple<span> </span><br class="NoSpacing" />Glassy lustre<span> </span><br class="NoSpacing" />Hardness 4<span> </span><br class="NoSpacing" />Octahedral cleavage</p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">fluorite</div> </div> volatile https://wserv3.esc.cam.ac.uk/p1acollections/files/original/2b220318e8337f2ccddde4e3a52736b2.jpg c9f964a85e0bce7a4ae84d76bd8885d9 Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2>Apatite</h2> Description An account of the resource <div class="element"> <div class="element"> <h3>Formula</h3> <div class="element-text">Ca₅(PO₄)₃(OH,F,Cl)</div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Non-silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>hexagonal (-)</p> </div> </div> <div class="element"> <h3>Physical Properties</h3> <div class="element-text"> <p><em>Colour in hand specimen:</em><span> </span>green, white, yellow, blue brown etc.<br /><em>Hardness:</em><span> </span>5</p> </div> </div> <div class="element"> <h3>Optical Properties</h3> <div class="element-text"> <p><em>Colour in plane polarised light:</em><span> </span>generally colourless<br /><em>Pleochroism:</em><span> </span>weak to moderate in coloured varieties<br /><em>Relief:</em><span> </span>moderate<br /><em>Birefrinence:</em><span> </span>0.001-0.007; first order greys<br /><em>Extinction:</em><span> </span>straight<br /><em>Form:</em><span> </span>commonly hexagonal in cross-section</p> </div> </div> <div class="element"> <h3>Rock Specimens</h3> <div class="element-text"> <p><a href="/p1acollections/exhibits/show/igneous-rocks/l100">L100 Alkali granite</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l101">L101 Granite</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l120">L120 Granodiorite</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l130">L130 Andesite, porphyritic (porphyrite)</a></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">apatite</div> </div> </div> igneous volatile https://wserv3.esc.cam.ac.uk/p1acollections/files/original/1e8ac03c3e758db9adb14e72134069b9.jpg a210d39bdb7a265dd1995b5a84c81d32 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/fa85045449503b9b13debcb0ed647816.jpg bb56a913d756bc4f72dc1c31698975c6 Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2>Dolomite</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text">CaMg(CO₃)₂</div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Non-silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>trigonal (-)</p> </div> </div> <div class="element"> <h3>Physical Properties</h3> <div class="element-text"> <p class="NoSpacing"><em><span>Colour in hand specimen:</span></em><span> white, often tinged with yellow or brown</span><span> </span><br class="NoSpacing" /><em><span>Cleavage:</span></em><span> rhombohedral</span><span> </span><br class="NoSpacing" /><em><span>Hardness:</span></em><span> 3.5-4 </span></p> </div> </div> <div class="element"> <h3>Optical Properties</h3> <div class="element-text"> <p class="NoSpacing"><em>Colour in plane polarised light:</em><span> </span>colourless<span> </span><br class="NoSpacing" /><em>Pleochroism:</em><span> </span>none<span> </span><br class="NoSpacing" /><em>Relief:</em><span> </span>low<span> </span><br class="NoSpacing" /><em>Birefringence:</em><span> </span>0.179-(0.185); &gt;4^{th<span> </span>}order<span> </span><br class="NoSpacing" /><em>Extinction:</em><span> </span>inclined<span> </span><br /><em>Twinning:</em><span> </span>lamellar, common</p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p class="NoSpacing"><strong><span>M543 Dolomite, associated with siderite and copper pyrites</span></strong><span> </span><br class="NoSpacing" /><strong>Cerro Blanco</strong><strong>, Chile</strong><strong></strong><span> </span><br class="NoSpacing" />Rhombohedral crystals of dolomite with curved faces, associated with siderite (iron carbonate) and copper pyrite<span> </span><br class="NoSpacing" />White, slightly grey<span> </span><br />Hardness 3.5 – 4</p> </div> </div> <div class="element"> <h3>Rock Specimens</h3> <div class="element-text"> <p><a href="/p1acollections/exhibits/show/sedimentary-rocks/l352">L352 Limestone, dolomitic</a></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">dolomite</div> </div> magnesium rhomb https://wserv3.esc.cam.ac.uk/p1acollections/files/original/131f9fed02c94c7ed59fdcc2af090a2a.jpg 643ac9583c58d950875775f7e70d6eb2 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/1601e70da0052a68594dec7a2514dd02.jpg 1cb9f4472a97823a8d51134194c923e3 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/cbeadd5a56f3203f1ba3e826c6a47243.jpg 36e3ea225c5242449ca4f9d8338eeda2 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/90389dcc429c1645fb7b37c3c2614530.jpg 1cd30f0903ab9fe7bf55172c5f95e63f Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2>Calcite</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text"> <p>CaCO₃</p> </div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Non-silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>trigonal (-)</p> </div> </div> <div class="element"> <h3>Physical Properties</h3> <div class="element-text"> <p><em>Colour in hand specimen:</em><span> </span>white<br /><em>Cleavage:</em><span> </span>rhombohedral<br /><em>Hardness:</em><span> </span>3</p> </div> </div> <div class="element"> <h3>Optical Properties</h3> <div class="element-text"> <p class="NoSpacing"><em><span>Colour in plane polarised light:</span></em><span> colourless</span><span> </span><br class="NoSpacing" /><em><span>Pleochroism:</span></em><span> none</span><span> </span><br class="NoSpacing" /><em><span>Relief:</span></em><span> low</span><span> </span><br class="NoSpacing" /><em><span>Birefringence:</span></em><span>0.172-(0.190); &gt;4^th order</span><span> </span><br class="NoSpacing" /><em><span>Extinction:</span></em><span> inclined</span><span> </span><br class="NoSpacing" /><em><span>Twinning:</span></em><span> lamellar, common</span></p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p class="NoSpacing"><strong><span>M540 Calcite with banded hematite</span></strong><span> </span><br class="NoSpacing" /><strong><span>Egremont, Cumberland</span></strong><span> </span><br class="NoSpacing" /><span>Mass of acicular (needle-like) calcite crystals</span><span> </span><br class="NoSpacing" /><span>Colourless with some grey and red impurities</span></p> <p class="NoSpacing"><strong><span>M541 Calcite</span></strong><span> </span><br class="NoSpacing" /><strong><span>Iceland spar</span></strong><span> </span><br class="NoSpacing" /><strong><span>Iskifjördhr</span></strong><strong><span>, Iceland</span></strong><strong></strong><span> </span><br class="NoSpacing" /><span>Single crystal of calcite</span><span> </span><br class="NoSpacing" /><span>Colourless, transparent</span><span> </span><br class="NoSpacing" /><span>Hardness 3</span><span> </span><br class="NoSpacing" /><span>Observe the double refraction </span><br class="NoSpacing" /><span>Rhombohedral cleavage (three cleavages)</span></p> <p class="NoSpacing"><strong><span>M542 Calcite vein material</span></strong><span> </span><br class="NoSpacing" /><strong><span>Minsterley, Shropshire</span></strong><span> </span><br class="NoSpacing" /><span>Rhombohedral cleavage (three cleavages)</span><span> </span><br class="NoSpacing" /><span>Pearly lustre</span><span> </span><br class="NoSpacing" /><span>Hardness 3</span></p> </div> </div> <div class="element"> <h3>Rock Specimens</h3> <div class="element-text"> <p><a href="/p1acollections/exhibits/show/igneous-rocks/l110">L110 Rhyolite, porphyritic (quartz porphyry)</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l130">L130 Andesite, porphyritic (porphyrite)</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l161">L161 Basalt, amygdaloidal</a><br /><a href="/exhibits/show/sedimentary-rocks/l325">L325 Sandstone, calcareous cement</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l341">L341 Mudstone, calcareous</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l350">L350 Limestone, argillaceous</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l353">L353 Limestone, oolitic, packstone</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l371">L371 Chert, bedded</a></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">calcite carbonate</div> </div> https://wserv3.esc.cam.ac.uk/p1acollections/files/original/eea0ce5b42c2fa513e4f5f9845e019fc.jpg cc4a42f011d53188d09b85125e3fe915 Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2>Anhydrite</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text"> <p>CaSO₄</p> </div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Non-silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>orthorhombic (+)</p> </div> </div> <div class="element"> <h3>Physical Properties</h3> <div class="element-text"> <p class="NoSpacing"><em><span>Colour in hand specimen:</span></em><span> white or colourless when pure</span><span> </span><br class="NoSpacing" /><em><span>Cleavage:</span></em><span> two at 90°</span><span> </span><br class="NoSpacing" /><em><span>Hardness:</span></em><span> 3-3.5</span></p> </div> </div> <div class="element"> <h3>Optical Properties</h3> <div class="element-text"> <p class="NoSpacing"><em><span>Colour in plane polarised light:</span></em><span> colourless</span><span> </span><br class="NoSpacing" /><em><span>Pleochroism:</span></em><span> none</span><span> </span><br class="NoSpacing" /><em><span>Relief:</span></em><span> low</span><span> </span><br class="NoSpacing" /><em><span>Birefringence:</span></em><span> ~0.04; 3^rd order blue</span><span> </span><br class="NoSpacing" /><em><span>Extinction: </span></em><span>straight</span><span> </span><br class="NoSpacing" /><em><span>Twinning:</span></em><span> simple or repeated</span></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">anhydrite</div> </div> evaporite sulfur https://wserv3.esc.cam.ac.uk/p1acollections/files/original/8f405f64623521e108d34b8ac6e9ef2b.jpg ad850366799f011921773473d420f89e https://wserv3.esc.cam.ac.uk/p1acollections/files/original/1a88452109e13e7129392147bb5e03ad.jpg c6e415aec066d49603afe47dc94cf415 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/050bc4eadcb75a778ba3577c7c3d4bd9.jpg e9a8dfa44409f9b288ff980f4b434275 Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2>Gypsum</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text"> <p>CaSO₄∙2H₂0</p> </div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Non-silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>monoclinic (+)</p> </div> </div> <div class="element"> <h3>Physical Properties</h3> <div class="element-text"> <p><em>Colour in hand specimen:</em><span> </span>usually white or colourless<br /><em>Cleavage:</em><span> </span>rhombohedral, one perfect, two distinct<br /><em>Hardness:</em><span> </span>2</p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p class="NoSpacing"><strong><span>M530 Gypsum</span></strong><span> </span><br class="NoSpacing" /><strong>Shotover, Oxford</strong><strong><span> </span></strong><br class="NoSpacing" />Single euhedral crystal<span> </span><br class="NoSpacing" />Colourless, transparent<span> </span><br class="NoSpacing" />Hardness 2; Soft – scratched with your fingernail</p> <p class="NoSpacing"><strong><span>M531 Massive gypsum</span></strong><span> </span><br class="NoSpacing" /><strong>Nottingham</strong><strong></strong><span> </span><br class="NoSpacing" />Fibrous habit – many fine crystals<span> </span><br class="NoSpacing" />White-cream colour<span> </span><br class="NoSpacing" />Translucent<span> </span><br class="NoSpacing" />Pearly lustre</p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">gypsum</div> </div> fingernail sulfur https://wserv3.esc.cam.ac.uk/p1acollections/files/original/7c07587ccec8258cb010781124a0479b.jpg edb193c154ce6e3235f791c8162f84de https://wserv3.esc.cam.ac.uk/p1acollections/files/original/1065d0bade11c5ce4a1ea5321a39a27e.jpg a9a01f476ba1204e36ea0f961c5793d6 Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2>Galena</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text"> <p>PbS</p> </div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Non-silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>cubic</p> </div> </div> <div class="element"> <h3>Physical Properties</h3> <div class="element-text"> <p><em>Colour in hand specimen:</em><span> </span>lead grey<br /><em>Streak:</em><span> </span>lead grey<br /><em>Lustre:</em><span> </span>metallic<br /><em>Cleavage:</em><span> </span>one, perfect<br /><em>Hardness:</em><span> </span>2.5</p> </div> </div> <div class="element"> <h3>Optical Properties</h3> <div class="element-text"> <p><em>Colour in plane polarised light:</em><span> </span>opaque<br /><em>Relief:</em><span> </span>high</p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p class="NoSpacing"><strong><span>M412 </span></strong><strong><span>Quartz (with galena and pyrite)</span><span> </span></strong><br class="NoSpacing" /><strong>North Wales</strong><strong></strong><span> </span><br class="NoSpacing" />A mass of small hexagonal quartz prisms, with galena, pyrite and zinc blende.<span> </span><br class="NoSpacing" />Transparent, white to light grey<span> </span><br class="NoSpacing" />Galena: purple-black, shiny, platy habit, metallic<span> </span><br />Pyrite: metallic lustre, gold colour, cubic habit, “Fools’ gold”</p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">galena</div> </div> dense grey streak https://wserv3.esc.cam.ac.uk/p1acollections/files/original/39ae47b23110f61dc6a0c406affbbf52.jpg 51f4085ac65b27fbab76ae783f7698e8 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/a80ea2f1702b30aebd3ac07020f12cc1.jpg a9a01f476ba1204e36ea0f961c5793d6 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/0a1c0e8dce3c906fbeeabf056b982815.jpg c0cd2b4702f158ae577237cf1bfb934d Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2>Pyrite</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text">FeS₂</div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Non-silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>cubic</p> </div> </div> <div class="element"> <h3>Physical Properties</h3> <div class="element-text"> <p><em>Colour in hand specimen:</em><span> </span>pale brassy yellow; black when fine-grained<br /><em>Streak:</em><span> </span>greenish or brownish<br /><em>Lustre:</em><span> </span>metallic<br /><em>Cleavage:</em><span> </span>not obvious<br /><em>Hardness:</em><span> </span>6-6.5</p> </div> </div> <div class="element"> <h3>Optical Properties</h3> <div class="element-text"> <p><em>Colour in plane polarised light:</em><span> </span>opaque</p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p class="NoSpacing"><strong><span>M520 Slate containing pyrite<br class="NoSpacing" /></span>Coniston, Lancashire <span><br class="NoSpacing" /></span></strong>Cubic crystals, embedded in a well-cleaved slate <br class="NoSpacing" />Golden colour <br class="NoSpacing" />Metallic lustre <br />Indistinct cleavage in places</p> <p class="NoSpacing"><strong><span>M412 </span></strong><strong><span>Quartz (with galena and pyrite)</span></strong><span> </span><br class="NoSpacing" /><strong>North Wales</strong><strong></strong><span> </span><br class="NoSpacing" />A mass of small hexagonal quartz prisms, with galena, pyrite and zinc blende.<span> </span><br class="NoSpacing" />Transparent, white to light grey<span> </span><br class="NoSpacing" />Galena: purple-black, shiny, platy habit, metallic<span> </span><br class="NoSpacing" />Pyrite: metallic lustre, gold colour, cubic habit, “Fools’ gold”</p> </div> </div> <div class="element"> <h3>Rock Specimens</h3> <div class="element-text"> <p><a href="/p1acollections/exhibits/show/igneous-rocks/l112">L112 Rhyolite</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l371">L371 Chert, bedded</a></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">pyrite<br />opaques</div> </div> cubic felsic gold sedimentary https://wserv3.esc.cam.ac.uk/p1acollections/files/original/3609ef5a5513cbf5914369118a83e223.jpg 37e8768bf174c1964fad35943172adcd https://wserv3.esc.cam.ac.uk/p1acollections/files/original/876136d4968a419d4264dca9fc74aad8.jpg 87a4d2250300ccf7b8355307ce0a356a https://wserv3.esc.cam.ac.uk/p1acollections/files/original/7c5c1965751afc7caa43cb98b132ac56.jpg 0e28846df3f83b9f340589ac0481908d Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2>Magnetite</h2> Subject The topic of the resource <div class="element-set"> <div class="element"> <div class="element-text"> <p>Magnetite is the most abundant oxide in igneous rock.</p> </div> </div> </div> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text"> <p>Fe₃O₄</p> </div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Non-silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>cubic</p> </div> </div> <div class="element"> <h3>Physical Properties</h3> <div class="element-text"> <p><em>Colour in hand specimen:</em><span> </span>black<br /><em>Streak:</em><span> </span>black<br /><em>Cleavage:</em><span> </span>none<br /><em>Hardness:</em><span> </span>7.5-8</p> </div> </div> <div class="element"> <h3>Optical Properties</h3> <div class="element-text"> <p><em>Colour in plane polarised light:</em><span> </span>almost opaque<br /><em>Relief:</em><span> </span>high<br />Isotropic</p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p class="NoSpacing"><strong><span>M501 </span></strong><strong><span>Magnetite</span></strong><span> </span><br class="NoSpacing" /><strong>Brazil</strong><strong></strong><span> </span><br class="NoSpacing" />Crystals showing the characteristic octahedral form<span> </span><br class="NoSpacing" />Silver-black colour<span> </span><br class="NoSpacing" />Metallic lustre</p> <p class="NoSpacing"><strong><span>M502 </span></strong><strong><span>Magnetite</span></strong><span> </span><br class="NoSpacing" /><strong>Hay Tor, Devon</strong><strong></strong><span> </span><br class="NoSpacing" />A mass of small octahedral crystals embedded in a metamorphic rock<span> </span><br class="NoSpacing" />Silver-black<span> </span><br class="NoSpacing" />Metallic lustre<span> </span><br />No cleavage</p> </div> </div> <div class="element"> <h3>Rock Specimens</h3> <div class="element-text"> <p><a href="/p1acollections/exhibits/show/igneous-rocks/l102">L102 Hornblende biotite granite</a><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l120">L120 Granodiorite, accessory</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l141">L141 Gabbro, olivine decomposition, accessory</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l162">L162 Basalt, porphyritic, feldspar inclusion</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l172">L172 Ultramafic cumulate, olivine alteration</a></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">magnetite<br />iron oxide<br />opaques</div> </div> igneous