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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>L101<br /></strong></h2>
<h2>Granite</h2>
Subject
The topic of the resource
<h3><strong>Age</strong></h3>
Caledonian, Devonian<br /><br /><h3><strong> Location</strong></h3>
Shap Fell, Cumbria
Description
An account of the resource
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<h3 class="element-set"><strong>Hand</strong> Specimen</h3>
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<p>Coarse-grained,<span> </span><a href="/p1acollections/items/show/244">porphyritic</a><span> </span>texture.<span> </span><br /><a href="/p1acollections/items/show/236">Phenocrysts</a><span> </span>of pink feldspar, 10-30 mm long,<span> </span><a href="/p1acollections/items/show/258">tabular</a>, display clear<span> </span><a href="/p1acollections/items/show/180">cleavage</a> planes.<span> </span><br /><a href="/p1acollections/search?query=groundmass&query_type=keyword&record_types%5B%5D=Item&record_types%5B%5D=File&record_types%5B%5D=Collection&record_types%5B%5D=Exhibit&record_types%5B%5D=ExhibitPage&record_types%5B%5D=SimplePagesPage&submit_search=Search">Groundmass</a><span> </span>of coarse-grained white feldspar, pink feldspar, quartz and biotite.<span> </span><br />Quartz grains are<span> </span><a href="/p1acollections/items/show/173">anhedral</a><span> </span>and display their characteristic<span> </span><a href="/p1acollections/items/show/182">conchoidal fracture</a><span> </span>and<span> </span><a href="/p1acollections/items/show/265">vitreous lustre</a>.</p>
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<h3>Thin-section</h3>
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<p>Alkali feldspar (orthoclase)<span> </span><br />- Pink phenocrysts up to ~10 mm long, relatively fresh (unaltered).</p>
<p>Groundmass<span> </span><br />- Feldspar (both plagioclase and alkali) grains 1-4mm long, mainly<span> </span><a href="/p1acollections/items/show/256">subhedral</a>, though some are quite<span> </span><a href="/p1acollections/items/show/215">lath</a><span> </span>shaped. Partially altered. The plagioclase grains display their characteristic<span> </span><a href="/p1acollections/items/show/169">lamellar twinning</a>.<span> </span><br />- Biotite grains (0.5-2 mm) with subhedral to anhedral<span> </span><a href="/p1acollections/items/show/206">form</a>. Grains have ragged edges and are partially altered to chlorite, mainly along<span> </span><a href="/p1acollections/items/show/180">cleavage</a><span> </span>planes.<span> </span><br />- Quartz grains (typically 2-5 mm) contain lots of tiny<span> </span><a href="/p1acollections/items/show/210">inclusions</a><span> </span>and display<span> </span><a href="/p1acollections/items/show/263">undulose extinction</a>.</p>
<p>Accessory minerals<span> </span><br />- Sphene<span> </span><br />- Apatite<span> </span><br />- Opaque mineral</p>
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<h3>Rock History</h3>
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<p>Porphyritic texture means this rock underwent two stages of cooling; phenocrysts crystallised first followed by the groundmass. The groundmass is coarse-grained, and must have crystallised slowly as part of an intrusion.</p>
<p>Plagioclase and alkali feldspar both occur in this rock, indicating that it formed at high pressures.</p>
<p>Granitic composition (essential quartz and feldspar) indicates that it was produced in a continental setting. Late-stage<span> </span><a href="/p1acollections/items/show/170">alteration</a>.</p>
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<h3>Advanced Notes</h3>
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<p>This rock is classified as an<span> </span><span>adamellite</span><span> </span>because it contains roughly equal proportions of alkali feldspar and plagioclase feldspar, as well as biotite and quartz.</p>
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<h3>Rock Name</h3>
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<p>granite<br />adamellite</p>
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alkali
alteration
feldspar