1 10 4 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/7b2be47bf331c3137fab55b54dd00400.jpg 4df92e4c361bdf836240b34aa1def201 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/a9feaa0d7b228322ef58f10eabce759a.jpg 2b6715ada6c2fb263e952153d2c695a1 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>Hematite</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text"> <p>Fe₂O₃</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 class="NoSpacing"><em><span>Colour in hand specimen: </span></em><span>black, steel-grey and bright to dull red</span><span> </span><br class="NoSpacing" /><em><span>Streak:</span></em><span> cherry-red</span><span> </span><br class="NoSpacing" /><em><span>Cleavage:</span></em><span> none</span><span> </span><br class="NoSpacing" /><em><span>Hardness:</span></em><span> 5-6</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> opaque; blood-red in very thin splinter</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> high</span></p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p class="NoSpacing"><strong><span>M500 Hematite</span></strong><span> </span><br class="NoSpacing" /><strong>Cumberland</strong><strong></strong><span> </span><br class="NoSpacing" />A concretionary mass showing concentric and radial structure<span> </span><br class="NoSpacing" />Silvery black with a red streak<span> </span><br class="NoSpacing" />Oxidised to dark brown-red in places<span> </span><br />Metallic lustre</p> </div> </div> <div class="element"> <h3>Rock Specimens</h3> <div class="element-text"> <p><a href="/p1acollections/exhibits/show/sedimentary-rocks/l310">L310 Breccia</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l311">L311 Conglomerate</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l324">L324 Sandstone, feldspathic arenite</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l326">L326 Sandstone, ferruginous arenite</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l340">L340 Mudstone</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l354">L354 Limestone, shelly</a><br /><a href="/p1acollections/exhibits/show/metamorphic-rocks/l500">L500 Slate</a></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">hematite<br />iron oxide<br />opaques</div> </div> oxidation sedimentary https://wserv3.esc.cam.ac.uk/p1acollections/files/original/0bf5d3a466fa7829e4ef2bdff830625a.jpg 6cd884f723303bde9f49b486c09d2b91 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/26bbd90e23750b6cd8f025a7c4477901.jpg a7e67bd99ca02148d530d0f06a0cc68b https://wserv3.esc.cam.ac.uk/p1acollections/files/original/301029738940ac75d82ed2ef3b0d90b2.jpg a9a01f476ba1204e36ea0f961c5793d6 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/96e67e3861b4a7dcb407f3b5f225bb27.jpg 30e1e24259599004ba7c7f6d73bf6953 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>Quartz</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text">SiO₂</div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Framework 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>Colour in hand specimen:</em><span> </span>colourless<span> </span><br class="NoSpacing" /><em>Lustre:</em><span> </span>vitreous<span> </span><br class="NoSpacing" /><em>Pleochroism:</em><span> </span>none<span> </span><br class="NoSpacing" /><em>Cleavage:</em><span> </span>none<span> </span><br /><em>Hardness:</em><span> </span>7</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 /><em>Birefringence:</em><span> </span>0.009; 1^st<span> </span>order grey</p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p class="NoSpacing"><strong><span>M410 </span></strong><strong><span>Quartz</span></strong><span> </span><br class="NoSpacing" />Characteristic prismatic crystal form: hexagonal cross-section, needle-like; hexagonal prism surmounted by a hexagonal pyramid<span> </span><br class="NoSpacing" />Colourless, transparent, milky in places<span> </span><br class="NoSpacing" /><strong></strong></p> <p class="NoSpacing"><strong><span>M411 </span></strong><strong><span>Quartz</span></strong><span> </span><br class="NoSpacing" /><strong>Madagascar</strong><strong></strong><span> </span><br class="NoSpacing" />Colourless, transparent quartz fragment, milky due to cracks and crystal boundaries<span> </span><br class="NoSpacing" />Vitreous lustre, conchoidal fracture, no cleavage</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/l101">L101 Granite</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l110">L110 Rhyolite, porphyritic (quartz porphyry)</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l120">L120 Granodiorite</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l311">L311 Conglomerate, matrix</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l323">L323 Sandstone, arenite</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l370">L370 Chert, flint nodule, cryptocrystalline</a><span> </span><br /><a href="/p1acollections/exhibits/show/metamorphic-rocks/l504">L504 Garnet schist</a><span> </span><br /><a href="/p1acollections/exhibits/show/metamorphic-rocks/l521">L521 Quartzite</a></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">silica<br />quartz</div> </div> igneous metamorphic milky sedimentary vitreous https://wserv3.esc.cam.ac.uk/p1acollections/files/original/2f7362a5c5cc5e00bc17ca856238ee37.jpg 44db79a97ef535c74d897e9db008bca0 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/94761134fac46b7078906210b5bb3b8f.jpg 323c8b77db6400b701b97ff8bcaa92f2 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/de6097beca8b60a758b218148982f48d.jpg cc38a8962e52d9ea6bf655b0c40038cd 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>Plagioclase feldspar</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text"> <p>Na[AlSi₃O₈] – Ca[Al₂Si₂O₈]</p> </div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Framework silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>triclinic (+) (-)</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</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> 6-6.5</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>~0.010, 1^st<span> </span>order grey<span> </span><br class="NoSpacing" /><em>Extinction:</em><span> </span>inclined<span> </span><br class="NoSpacing" /><em>Twinning:</em><span> </span>lamellar, very common</p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p class="NoSpacing"><strong><span>M403 </span></strong><strong><span>Plagioclase feldspar, oligoclase</span></strong><span> </span><br class="NoSpacing" /><strong>Ytterby</strong><strong>, Sweden</strong><strong></strong><span> </span><br class="NoSpacing" />A cleavage fragment of white plagioclase feldspar<span> </span><br class="NoSpacing" />Pearly lustre on cleavage planes<span> </span><br class="NoSpacing" />Two sets of cleavage at 90°<span> </span><br class="NoSpacing" />Fine parallel striations due to lamellar twinning</p> <p class="NoSpacing"><strong><span>M404 </span></strong><strong><span>Plagioclase feldspar, labradorite</span></strong><span> </span><br class="NoSpacing" /><strong>Labrador</strong><strong></strong><span> </span><br class="NoSpacing" />Dark grey, light where fragments are small due to cracking along cleavage<span> </span><br class="NoSpacing" />Schiller (blue iridescence), characteristic of labradorite<span> </span><br class="NoSpacing" />Very fine parallel striations due to lamellar twinning</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/l102">L102 Hornblende biotite granite</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l112">L112 Rhyolite</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><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l141">L141 Gabbro</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l162">L162 Basalt, porphyritic</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l172">L172 Ultramafic cumulate</a><span> </span><br /><a href="/p1acollections/exhibits/show/metamorphic-rocks/l504">L504 Garnet schist</a></p> </div> </div> <div class="element"> <h3>Advanced Notes</h3> <div class="element-text"> <p class="NoSpacing"><span>Plagioclase feldspar forms a continuous solid solution between the sodic endmember (albite, or Ab) and the calcic endmember (anorthite, or An). The series is sub-divided into albite (An_0-10), oligoclase (An_10-30) andesine (An_30-50), labradorite (An_50-70), bytownite (An_70-90) and anorthite (An_90-100).</span></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">plagioclase<br />feldspar</div> </div> felsic igneous mafic metamorphic sedimentary