26 10 264 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>Subhedral</h2> Subject The topic of the resource A crystal displaying some, but not all of its characteristic crystal faces is called subhedral. 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>Sutured contacts</h2> Subject The topic of the resource Usually refers to quartz grains, which have undergone partial recrystallisation, producing irregular, sutured grain boundaries. Description An account of the resource <em>Have a look at the <strong>quartzites (<a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/39">L520</a>, <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>Tabular</h2> Subject The topic of the resource Flat, planar, non-elongate crystals are described as having a tabular habit. Tabular crystals are thicker than platy crystals. 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>Tartan twinning</h2> Description An account of the resource <em>See<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/183">cross-hatched twinning</a>.</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>Tectosilicate</h2> Subject The topic of the resource <p>Framework silicate.</p> 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>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>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>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>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.