18 10 264 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/524e986697efa24bc1ff22d4953d1d36.png ee6848d2b6e9183fc720bad52d99a1ba https://wserv3.esc.cam.ac.uk/p1acollections/files/original/32a4fe83932bfa77b7bf45885f3eea1f.png 1a4ed41d2cd55101fd356fbfd2a42a2b 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/. Description An account of the resource This glossary describes a number of geological terms with which the 1A students should become familiar.<span> It is by no means an exhaustive list, but is aimed to help you understand the material within the first year course.</span> Title A name given to the resource Glossary 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>Foliation</h2> Subject The topic of the resource <span>This refers to any pervasive planar feature in a rock. It is produced by the arrangement of the constituent grains into sheet-like structures, usually in compositionally distinct layers. Foliations can be primary (e.g. bedding, fissility, flow banding) or secondary (e.g. cleavage).</span> 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/. Description An account of the resource This glossary describes a number of geological terms with which the 1A students should become familiar.<span> It is by no means an exhaustive list, but is aimed to help you understand the material within the first year course.</span> Title A name given to the resource Glossary 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>Form</h2> Description An account of the resource <em>See<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/206">habit</a>.</em> 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/74710dbf85be2a6e9e238ba537ef6ad4.jpg 28595880e272b17b8a23671cdc97d677 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>Garnet</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text">(Mg,Fe,Ca)₃Al₂Si₃O₁₂</div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Orthosilicate</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>typically red<br /><em>Cleavage:</em><span> </span>none<br /><em>Hardness:</em><span> </span>6-7.5</p> </div> </div> <div class="element"> <h3>Optical Properties</h3> <div class="element-text"> <p><em>Colour in plane polarised light:</em><span> </span>colourless, pale pink<span> </span><br /><em>Pleochroism:</em><span> </span>none<br /><em>Relief:</em><span> </span>high<br />Isotropic</p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p><span><strong>M130 Garnet schist</strong></span><br /><strong>Portsoy, Banffshire</strong><br />Euhedral porphyroblasts of dark-red garnet, with quartz, mica and other minerals in a medium-grade metamorphic rock.</p> </div> </div> <div class="element"> <h3>Rock Specimens</h3> <div class="element-text"> <p><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>The garnet group encompasses a wide range of compositions, and consequently a range of optical and physical properties. The properties detailed above are typical of pyrope (Mg₃Al₂Si₃O₁₂), almandine (Fe²⁺₃Al₂Si₃O₁₂) and grossular (Ca₃Al₂Si₃O₁₂).</p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">garnet</div> </div> metamorphism metapelite https://wserv3.esc.cam.ac.uk/p1acollections/files/original/c6b9427325c8a625a1fb715e2ba9b761.png b6c4554bb25cbd01fe2923d72ebaa959 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/852990c0fa5efed6ff5d4c9668161751.png 826993442acd7add97b325580bd69a2c 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 Fossils Description An account of the resource <p>Welcome to the fossils section of the website. This is designed to help you learn the different characteristics of each major fossil group so that you are able to distinguish between them.</p> <p>First year students, please refer to the specimens housed in the first year teaching laboratory. There is no substitute for handling the specimens themselves; this website is just an accessory to help you along the way.</p> <p>Animals occupy different environments, have different life habits and lived through different periods in geological time. It is good to be aware of these differences in lifestyle and timing, within and between phyla, classes, orders and families.</p> 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>Gastropod</h2> Description An account of the resource <h2>Taxonomy</h2> <p>Phylum: Mollusca</p> <p>Class: Gastropoda</p> <h2>Diagnostic Features</h2> <p>Coiled shell - planispiral or helical - consists of body whorl and spire</p> <p>Mostly aragonitic shell</p> <p>Shell consists of one large chamber (no septa)</p> <p>Aperture</p> <p>Siphonal notch</p> <h2>Way of life</h2> <p>Marine, non-marine, land-dwelling</p> <p>Carnivorous, scavenging, deposit feeding and more</p> <h2>Advanced notes</h2> <p>Because of their conservative shell shape it is difficult to use gastropods as environmental or stratigraphic indicators.</p> <h2>Specimens</h2> <p><a href="/p1acollections/exhibits/show/gastropods" target="_blank" rel="noreferrer noopener">Browse gastropods</a></p> <h2>External links</h2> <p><a href="https://www.youtube.com/watch?v=2ilSDcZAXNM" target="_blank" rel="noreferrer noopener">Telling planispiral fossils apart</a></p> coil 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/. Description An account of the resource This glossary describes a number of geological terms with which the 1A students should become familiar.<span> It is by no means an exhaustive list, but is aimed to help you understand the material within the first year course.</span> Title A name given to the resource Glossary 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>Glass</h2> Subject The topic of the resource <span>When magma is quenched (cooled exceedingly rapidly) even very small crystals are unable to grow. Instead, a volcanic glass is formed. It is amorphous (having no crystalline structure), and is consequently isotropic.</span> Description An account of the resource <em>Have a look at the<strong> rhyolite glass (<a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/7">L113</a>)</strong><span> </span>in the 1A Reference Series.</em> 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/. Description An account of the resource This glossary describes a number of geological terms with which the 1A students should become familiar.<span> It is by no means an exhaustive list, but is aimed to help you understand the material within the first year course.</span> Title A name given to the resource Glossary 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>Glomerocryst</h2> Subject The topic of the resource <span>A glomerocryst is a clump of phenocrysts. A rock in which clumping of phenocrysts is abundant and pervasive is said to have a glomeroporphyritic texture.</span> 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/. Description An account of the resource This glossary describes a number of geological terms with which the 1A students should become familiar.<span> It is by no means an exhaustive list, but is aimed to help you understand the material within the first year course.</span> Title A name given to the resource Glossary 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>Glomeroporphyritic</h2> Subject The topic of the resource <span>This is an igneous texture in which phenocrysts clump together, within a fine-grained groundmass.</span> 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/. Description An account of the resource This glossary describes a number of geological terms with which the 1A students should become familiar.<span> It is by no means an exhaustive list, but is aimed to help you understand the material within the first year course.</span> Title A name given to the resource Glossary 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>Granular (or phaneritic)</h2> Subject The topic of the resource This texture refers to an igneous or metamorphic rock which consists entirely of interlocking, roughly equant grains, large enough to be seen with naked eye. Description An account of the resource <em>Have a look at the <strong>hornblende biotite granite (<a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/4">L102</a>) </strong>in the 1A Reference Series.</em> https://wserv3.esc.cam.ac.uk/p1acollections/files/original/b90e25b863bee88dd35e7098a3f2d7e4.png 8fced3dedf73544613df96bc297954fd 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/. Description An account of the resource This glossary describes a number of geological terms with which the 1A students should become familiar.<span> It is by no means an exhaustive list, but is aimed to help you understand the material within the first year course.</span> Title A name given to the resource Glossary 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>Graphic texture</h2> Subject The topic of the resource <span>The regular intergrowth of two minerals (usually quartz and feldspar), which crystallised simultaneously. It is called “graphic” because the intergrowths resemble writing.</span>