7 10 264 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/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/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/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/544be5dfa4507d24e71d16f1869a917f.png 256b4151e204917f9e3cdf24077e0902 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/5c2a07c0b21f88a97bec78216944a106.png 178f17ee9d5f859c42ec294d2b5851ff 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><strong>TF0327<br /></strong></h2> <h2>Heteromorphic ammonite</h2> Description An account of the resource <div class="element"> <h3>Species</h3> <div class="element-text">Scaphites</div> </div> <div class="element"> <h3>Stratigraphic Range</h3> <div class="element-text">Cretaceous</div> </div> <div class="element"> <h3>Taxonomy</h3> <div class="element-text">Phylum: Mollusca<br />Class: Cephalopoda<br />Subclass: Ammonoidea<br />Order: Ammonitida<br /><br /></div> </div> <div class="element"> <h3>Distinctive Features</h3> <div class="element-text">'g' shaped coiled shell<br />Ribs<br />Involute<br />Ammonitic suture lines</div> </div> <div class="element"> <h3>Preservation</h3> <div class="element-text">Internal mould</div> </div> <div class="element"> <h3>Advanced notes</h3> <div class="element-text">Heteromorphic ammonites (such as Scaphites) diversified during the late Cretaceous. They may have lived as planktonic or benthic organisms depending on where the centre of gravity lies in the shell, which is much dependent on the soft parts. Sadly these soft parts rarely preserve.</div> </div> Cretaceous suture https://wserv3.esc.cam.ac.uk/p1acollections/files/original/b003b76d4dfb95997069968d69a4cc20.png 01968adc5de6bf9128d57aa05631ae15 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/a13515476842a5be081676dfcd2b8b68.png 15ce829d715bc9420c8a9d9cff82263b 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><strong>TF0326<br /></strong></h2> <h2>Ammonite</h2> Description An account of the resource <div class="element"></div> <div class="element"> <div class="element"> <h3>Species</h3> <div class="element-text">Anahoplites splendens</div> </div> <div class="element"> <h3>Stratigraphic Range</h3> <div class="element-text">Cretaceous</div> </div> <div class="element"> <h3>Taxonomy</h3> <div class="element-text">Phylum: Mollusca<br />Class: Cephalopoda<br />Subclass: Ammonoidea<br />Order: Ammonitida<br /><br /><br /></div> </div> <div class="element"> <h3>Distinctive Features</h3> <div class="element-text">Planispiral<br />Involute<br />Ammonitic suture pattern<br />Ribs</div> </div> <div class="element"> <h3>Preservation</h3> <div class="element-text">Internal mould, pyritised</div> </div> <div class="element"> <h3>Advanced notes</h3> <div class="element-text">For the specimen in set 1 only part of the whole shell is present. The rest has either broken off or not been preserved at all.</div> </div> <div class="element-text"></div> </div> ammonite Cretaceous Jurassic suture https://wserv3.esc.cam.ac.uk/p1acollections/files/original/1dd5d1b6aafd5e06176f0ceef151d20c.png 6f588e608ac7e1d45bb11da8ab8cb8b8 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/885d5d5aa870bbe635af21aba143e1ee.png d32c2f8ebcd02135a0dec0d8fcb4dd3d 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><strong>TF0325<br /></strong></h2> <h2>Ammonite</h2> Description An account of the resource <h3>Species</h3> <div class="element-set"> <div class="element"> <div class="element-text">Deshayesites</div> </div> <div class="element"> <h3>Stratigraphic Range</h3> <div class="element-text">Cretaceous</div> </div> <div class="element"> <h3>Taxonomy</h3> <div class="element-text">Phylum: Mollusca<br />Class: Cephalopoda<br />Subclass: Ammonoidea<br />Order: Ammonitida<br /><br /><br /></div> </div> <div class="element"> <h3>Distinctive Features</h3> <div class="element-text">Planispiral<br />Ammonitic suture pattern<br />Evolute<br />Ribs<br />Aperture</div> </div> <div class="element"> <h3>Preservation</h3> <div class="element-text">Internal mould, with aperture partially crushed</div> </div> </div> Cretaceous Jurassic suture https://wserv3.esc.cam.ac.uk/p1acollections/files/original/927f8fe99cb56579e9f3314a48c3ba97.png f120287b0ec1334cb33c4b2d98654802 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/1dc09457e504e34107e00bfe23fc5a88.png bd0252a16a388518c1c8ba18a3518358 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><strong>TF0324<br /></strong></h2> <h2>Ammonite</h2> Description An account of the resource <div class="element"> <h3>Species</h3> <div class="element-text">Amoeboceras alternans</div> </div> <div class="element"> <h3>Stratigraphic Range</h3> <div class="element-text">Jurassic</div> </div> <div class="element"> <h3>Taxonomy</h3> <div class="element-text">Phylum: Mollusca<br />Class: Cephalopoda<br />Subclass: Ammonoidea<br />Order: Ammonitida<br /><br /><br /></div> </div> <div class="element"> <h3>Distinctive Features</h3> <div class="element-text">Planispiral<br />Ammonitic suture lines visible on some moulds<br />Ribs</div> </div> <div class="element"> <h3>Preservation</h3> <div class="element-text">Most external moulds, few examples of internal moulds, pyritised</div> </div> Jurassic suture https://wserv3.esc.cam.ac.uk/p1acollections/files/original/40cb75eae11af32a0de3c8903284bb97.png 397453cebe3f0e1234d09f7db5a316ba https://wserv3.esc.cam.ac.uk/p1acollections/files/original/882f798c3216556110c2b7d7a757cb60.png 2aa1714c226dd063819489d852cd8be9 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><strong>TF0323<br /></strong></h2> <h2>Ammonite</h2> Description An account of the resource <div class="element"> <h3>Species</h3> <div class="element-text">Parkinsonia parkinsonia</div> </div> <div class="element"> <h3>Stratigraphic Range</h3> <div class="element-text">Jurassic</div> </div> <div class="element"> <h3>Taxonomy</h3> <div class="element-text">Phylum: Mollusca<br />Class: Cephalopoda<br />Subclass: Ammonoidea<br />Order: Ammonitida<br /><br /><br /></div> </div> <div class="element"> <h3>Distinctive Features</h3> <div class="element-text">Planispiral<br />Evolute<br />Ribs<br />Ammonitic suture lines</div> </div> <div class="element"> <h3>Preservation</h3> <div class="element-text">Calcite has replaced aragonite in the skeleton</div> </div> <div class="element"> <h3>Advanced notes</h3> <div class="element-text">Beware! The specimen in set 2 has a dark circular hole, which you may be tempted to identify as a siphuncle. However remember that in ammonoids the siphuncle runs around the outer edge of the chambers, so this hole is in the wrong place. It is probably there due to eccentricities of the mineralisation process.<br /><br />Why is it a dark colour when the rest of the shell is white? Generations of Earth Scientists have made the same mistake, their pencil marks fooling others into making the same error.</div> </div> Jurassic suture https://wserv3.esc.cam.ac.uk/p1acollections/files/original/bd55e697b4a4dfca85badc4739571904.png c7ed5a2e9fd0159645b1431c3cdd2ca7 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/acd37426f2c975b764eb0af5fa2d8694.png 53bf17c2f264c97aa33c1586d41fd7bc 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><strong>TF0322<br /></strong></h2> <h2>Ammonite</h2> Description An account of the resource <div class="element"> <h3>Species</h3> <div class="element-text">Hildoceras bifrons</div> </div> <div class="element"> <h3>Stratigraphic Range</h3> <div class="element-text">Jurassic</div> </div> <div class="element"> <h3>Taxonomy</h3> <div class="element-text">Phylum: Mollusca<br />Class: Cephalopoda<br />Subclass: Ammonoidea<br />Order: Ammonitida</div> </div> <div class="element"> <h3>Distinctive Features</h3> <div class="element-text">Planispiral<br />Evolute<br />Ribs</div> </div> <div class="element"> <h3>Preservation</h3> <div class="element-text">Mineral replacement of shell (aragonite to silica)</div> </div> Jurassic