1 10 264 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/29f822c37a1f2f22aecf08ab9ddcad85.pdf 0f3d81bba57b4650a1a2781dc0c4bc86 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 Chronostratigraphic Chart https://wserv3.esc.cam.ac.uk/p1acollections/files/original/3f8f02288db286084d1387e652ff1b88.pdf fea2b86af3cc8db11df9d23f60fb6b50 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 Michel-Levy Chart 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>Zonation</h2> Subject The topic of the resource As a crystal grows slowly in a magma chamber the magma from which it is crystallising may evolve, changing its composition. Thus later crystallising regions or “zones” of the crystal will have a slightly different composition from earlier crystallising regions. The crystal thus displays zonation.<br />Zonation is seen under cross-polarised light by variations in the birefringence colours of the different zones. Description An account of the resource <em>Have a look at the <strong>granodiorite (<a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/8">L120</a>)</strong> 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>Volcanic</h2> Subject The topic of the resource Volcanic rocks and textures are those associated with magmatic eruptions at the surface of the Earth. These eruptions can occur into air, water or ice. In each case cooling is very rapid, causing fine-grained textures to develop. 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>Vitreous [lustre]</h2> Subject The topic of the resource Minerals displaying a glass-like lustre are described as vitreous. These minerals are transparent or translucent and have relatively low refractive indices. Quartz and calcite, for example, have vitreous lustre. Description An account of the resource Have a look at <a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/57">quartz</a> (M410, M411, M412) and <a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/64">calcite</a> (M540, M541, M542) in the Reference Series. 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>Vesicular</h2> Subject The topic of the resource Igneous rocks with a vesicular texture contain air bubbles, called vesicles. These can be round or distorted. In thin-section, vesicles are filled with the mounting medium and consequently appear clear and colourless with low relief under plain polarised light. They are isotropic. Vesicles which are infilled with precipitated minerals, such as calcite or quartz are called amygdales. Description An account of the resource Have a look at the rhyolitic glass (<a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/7">L113</a>) and the porphyritic andesite (<a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/9">L130</a>) in the 1A Reference Series. 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>Undulose extinction</h2> Subject The topic of the resource If some areas of a mineral grain have different extinction positions from other areas of the same grain, the grain is said to display undulose extinction. Importantly, there is no sharp division between areas with different extinction positions; otherwise the phenomenon could be due to twinning. Undulose extinction is frequently observed in strained quartz, where the crystal lattice has been distorted by being squeezed. Description An account of the resource <em>Have a look at the <strong>ferruginous sandstone (<a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/26">L327</a>) </strong>and the<strong> quartzite (<a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/40">L521</a>)</strong> 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>Twinning</h2> Subject The topic of the resource Within a single mineral grain the crystal lattice may be oriented differently on either side of a plane, or twin plane. Thus the grain will go into extinction at different positions on either side of the twin plane. This is twinning. 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>Turbidite</h2> Subject The topic of the resource Sedimentary rock structure characterised by a fining-up sequence. They are produced by turbidity flows. 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>Tectosilicate</h2> Subject The topic of the resource <p>Framework silicate.</p>