1 10 6 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/39ae47b23110f61dc6a0c406affbbf52.jpg 51f4085ac65b27fbab76ae783f7698e8 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/a80ea2f1702b30aebd3ac07020f12cc1.jpg a9a01f476ba1204e36ea0f961c5793d6 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/0a1c0e8dce3c906fbeeabf056b982815.jpg c0cd2b4702f158ae577237cf1bfb934d 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>Pyrite</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text">FeS₂</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>pale brassy yellow; black when fine-grained<br /><em>Streak:</em><span> </span>greenish or brownish<br /><em>Lustre:</em><span> </span>metallic<br /><em>Cleavage:</em><span> </span>not obvious<br /><em>Hardness:</em><span> </span>6-6.5</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</p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p class="NoSpacing"><strong><span>M520 Slate containing pyrite<br class="NoSpacing" /></span>Coniston, Lancashire <span><br class="NoSpacing" /></span></strong>Cubic crystals, embedded in a well-cleaved slate <br class="NoSpacing" />Golden colour <br class="NoSpacing" />Metallic lustre <br />Indistinct cleavage in places</p> <p class="NoSpacing"><strong><span>M412 </span></strong><strong><span>Quartz (with galena and pyrite)</span></strong><span> </span><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 class="NoSpacing" />Pyrite: metallic lustre, gold colour, cubic habit, “Fools’ gold”</p> </div> </div> <div class="element"> <h3>Rock Specimens</h3> <div class="element-text"> <p><a href="/p1acollections/exhibits/show/igneous-rocks/l112">L112 Rhyolite</a><span> </span><br /><a href="/p1acollections/exhibits/show/sedimentary-rocks/l371">L371 Chert, bedded</a></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">pyrite<br />opaques</div> </div> cubic felsic gold sedimentary https://wserv3.esc.cam.ac.uk/p1acollections/files/original/2f7362a5c5cc5e00bc17ca856238ee37.jpg 44db79a97ef535c74d897e9db008bca0 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/94761134fac46b7078906210b5bb3b8f.jpg 323c8b77db6400b701b97ff8bcaa92f2 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/de6097beca8b60a758b218148982f48d.jpg cc38a8962e52d9ea6bf655b0c40038cd 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>Plagioclase feldspar</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text"> <p>Na[AlSi₃O₈] – Ca[Al₂Si₂O₈]</p> </div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Framework silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>triclinic (+) (-)</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</span><span> </span><br class="NoSpacing" /><em><span>Cleavage:</span></em><span> two at 90°</span><span> </span><br class="NoSpacing" /><em><span>Hardness:</span></em><span> 6-6.5</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>~0.010, 1^st<span> </span>order grey<span> </span><br class="NoSpacing" /><em>Extinction:</em><span> </span>inclined<span> </span><br class="NoSpacing" /><em>Twinning:</em><span> </span>lamellar, very common</p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p class="NoSpacing"><strong><span>M403 </span></strong><strong><span>Plagioclase feldspar, oligoclase</span></strong><span> </span><br class="NoSpacing" /><strong>Ytterby</strong><strong>, Sweden</strong><strong></strong><span> </span><br class="NoSpacing" />A cleavage fragment of white plagioclase feldspar<span> </span><br class="NoSpacing" />Pearly lustre on cleavage planes<span> </span><br class="NoSpacing" />Two sets of cleavage at 90°<span> </span><br class="NoSpacing" />Fine parallel striations due to lamellar twinning</p> <p class="NoSpacing"><strong><span>M404 </span></strong><strong><span>Plagioclase feldspar, labradorite</span></strong><span> </span><br class="NoSpacing" /><strong>Labrador</strong><strong></strong><span> </span><br class="NoSpacing" />Dark grey, light where fragments are small due to cracking along cleavage<span> </span><br class="NoSpacing" />Schiller (blue iridescence), characteristic of labradorite<span> </span><br class="NoSpacing" />Very fine parallel striations due to lamellar twinning</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/l102">L102 Hornblende biotite granite</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l112">L112 Rhyolite</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><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l141">L141 Gabbro</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l162">L162 Basalt, porphyritic</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l172">L172 Ultramafic cumulate</a><span> </span><br /><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 class="NoSpacing"><span>Plagioclase feldspar forms a continuous solid solution between the sodic endmember (albite, or Ab) and the calcic endmember (anorthite, or An). The series is sub-divided into albite (An_0-10), oligoclase (An_10-30) andesine (An_30-50), labradorite (An_50-70), bytownite (An_70-90) and anorthite (An_90-100).</span></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">plagioclase<br />feldspar</div> </div> felsic igneous mafic metamorphic sedimentary https://wserv3.esc.cam.ac.uk/p1acollections/files/original/7eda87156991f7c8b27a0e8510940358.jpg 2635d861ca5b4c2cbbd828726c95bfd4 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/dcc7eadcc1e8adacfb3ca0062cf15b41.jpg 35dd6efe13e1fca981d0837a56294e0b https://wserv3.esc.cam.ac.uk/p1acollections/files/original/4df0492facb5854e9375d2f627f192fe.jpg ffc9075681e5de8a163ba2009ad46bb1 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/52688639ee0b849fb604e43c822c434b.jpg 27a1d7561ed102f3dc1de4996962dd8d 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>Alkali feldspar</h2> Description An account of the resource <div class="element"> <div class="element"> <h3>Formula</h3> <div class="element-text"> <p>(K,Na)[AlSi₃O₈]</p> </div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Framework silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>monoclinic (-) or triclinic (+) (-)</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 or pink</span><span> </span><br class="NoSpacing" /><em><span>Cleavage:</span></em><span> two at 90°</span><span> </span><br class="NoSpacing" /><em><span>Hardness:</span></em><span> 6-6.5</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>~0.008; 1^st<span> </span>order greys<span> </span><br class="NoSpacing" /><em>Extinction:</em><span> </span>inclined<span> </span><br class="NoSpacing" /><em>Twinning: </em>usually simple or lamellar;<span> </span><br />              Microcline (KAlSi₃O₈) displays characteristic cross-hatched twinning</p> </div> </div> <div class="element"> <h3>Mineral Specimens</h3> <div class="element-text"> <p class="NoSpacing"><strong><span>M400 </span></strong><strong><span>Alkali feldspar, microcline</span></strong><span> </span><br class="NoSpacing" />A single crystal of pale orange-pink alkali feldspar.<span> </span><br class="NoSpacing" />Pearly lustre.</p> <p class="NoSpacing"><strong><span>M401 </span></strong><strong><span>Alkali feldspar, orthoclase</span></strong><span> </span><br class="NoSpacing" /><strong>Norway</strong><strong></strong><span> </span><br class="NoSpacing" />A fragment of opaque, pale grey alkali feldspar.<span> </span><br class="NoSpacing" />Two sets of good cleavage at right angles, with a pearly lustre on the cleavage faces.</p> <p class="NoSpacing"><strong><span>M402 </span></strong><strong><span>Alkali feldspar, orthoclase</span></strong><span> </span><br class="NoSpacing" /><strong>Shap, Westmorland</strong><span> </span><br class="NoSpacing" />Porphyritic granite.<span> </span><br class="NoSpacing" />Large phenocrysts of pink feldspar, two sets of cleavage at 90°, simple twinning.<span> </span><br class="NoSpacing" />Also white plagioclase feldspar, quartz and biotite<strong>.</strong></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/l102">L102 Hornblende biotite granite</a><span> </span><br /><a href="/p1acollections/exhibits/show/igneous-rocks/l110">L110 Rhyolite, porphyritic (quartz porphyry)</a></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">alkali feldspar</div> </div> </div> felsic granite rhyolite https://wserv3.esc.cam.ac.uk/p1acollections/files/original/c79ea7e24906cdc87124323d1c61c679.jpg 2dcf14e8ccd71331a82d77c757769562 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/65cc722b8ca1c5c78563e7830e432ad5.jpg 41095f6476cbd7f3f5fe86f7138c984c https://wserv3.esc.cam.ac.uk/p1acollections/files/original/560ec59ba2f299a27cb59a2103c356ac.jpg ac56cab3922729a7a2da4bfb245672a8 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>L120<br /></strong></h2> <h2>Granodiorite</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text">Caledonian, Devonian<br /><br /><h3>Location</h3> <div class="element-text">Boulder, Moor of Rannoch</div> </div> Description An account of the resource <div class="element-set"> <div class="element"> <div class="element-text"> <div class="element"> <div class="element-text five columns omega"> <h3>Hand Specimen</h3> </div> </div> <div class="element"> <div class="element-text five columns omega"> <div class="element-set"> <div class="element"> <div class="element-text">Mostly moderately coarse-grained (typically 1-2 mm), some regions finer-grained (typically ~0.5 mm).<span> </span><br />“Salt and pepper” appearance being speckled black and white. Two black phases, biotite mica and hornblende amphibole. White regions comprise quartz and white feldspar.</div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Hornblende amphibole<span> </span><br />- Pleochroic in greens and cream. Some of the grains display<span> </span><a href="/p1acollections/items/show/252">simple twinning</a>. Two<span> </span><a href="/p1acollections/items/show/180">cleavages</a><span> </span>intersect at 56°.</p> <p>Biotite<span> </span><br />-<span> </span><a href="/p1acollections/items/show/256">Subhedral</a><span> </span>to<span> </span><a href="/p1acollections/items/show/173">anhedral</a><span> </span>grains, pleochroic in brown and straw. Straight, speckled<span> </span><a href="/p1acollections/items/show/190">extinction</a>. Chlorite partially replaces biotite – late stage<span> </span><a href="/p1acollections/items/show/170">alteration</a>.</p> <p>Quartz<span> </span><br />- Anhedral,<span> </span><a href="/p1acollections/items/show/211">interstitial</a><span> </span>grains. They display<span> </span><a href="/p1acollections/items/show/263">undulose extinction</a><span> </span>and contain abundant tiny<span> </span><a href="/p1acollections/items/show/210">inclusions</a>, but are characteristically fresh and unaltered.</p> <p>Feldspar, mainly plagioclase<span> </span><br />- Mostly anhedral grains, though some are<span> </span><a href="/p1acollections/items/show/215">lath</a>-shaped. Alteration. Zonation.</p> <p>Accessory minerals:<span> </span><br />- Sphene<span> </span><br />- Magnetite<span> </span><br />- Apatite</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>Rock history Hornblende is<span> </span><a href="/p1acollections/items/show/189">euhedral</a>. It is, therefore a primary igneous phase, and must have crystallised from a wet melt.</p> <p>Magma cooled relatively slowly, allowing large crystals to grow.</p> </div> </div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">granodiorite</div> </div> </div> </div> </div> </div> </div> </div> coarse felsic interstitial https://wserv3.esc.cam.ac.uk/p1acollections/files/original/4963168143d5798d297e785330774a09.jpg db44deb968efb3a2ec86b6f143ebd868 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/87e0cb01dbb7b0b5d89066e0bdcaaf65.jpg c17b6506032fce0db90eece9ccce9f17 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/6059573330880ea41150025d6cfaf808.jpg 8dfef0d9df9d5721739f1e3d66aaeeee 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>L113<br /></strong></h2> <h2>Rhyolite, glassy (obsidian)</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text"> <p>Cenozoic</p> <h3>Location</h3> <div class="element-text"> <p>Yellowstone, U.S.A.</p> </div> </div> Description An account of the resource <div class="element"> <div class="element-text five columns omega"> <div class="element"> <div class="element-text five columns omega"> <p><em>NB, the term ‘obsidian’ refers to a jet-black glassy rock. It usually has a rhyolitic composition, but not always.</em></p> </div> </div> <div class="element"> <div class="element-text five columns omega"> <div class="element-set"> <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>Black rock with the characteristic<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/265">vitreous lustre</a><span> </span>and<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/182">conchoidal fracture</a><span> </span>of<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/200">glass</a>.<span> </span><br />The surfaces are scattered with tiny spherical holes. These are<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/264">vesicles</a>.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Holding the thin-section up to the light, the spherical<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/264">vesicles</a><span> </span>within the brown glass are clearly visible.</p> <p>Under the microscope the pale brown glass is scattered with tiny opaque speckles in a weak flow texture.</p> <p>Spherical vesicles are mostly filled in with mounting medium; notice its distinctive appearance under cross-polarised light. There are a small number of opaque infilled circles. These could be artefacts or black clumps of iron oxide.</p> <p>Tiny crystals are scattered throughout the glass, indicating that some devitrification has occurred. Circles of devitrification, probably nucleated on oxide crystals.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>Glass → Very rapidly cooled magma. Probably<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/191">extrusive</a>.<span> </span><br />Vesicles: perfectly spherical, indicating that they were not being sheared by magma flow, i.e. the magma was not flowing.</p> </div> </div> <div class="element"> <h3>Rock Name</h3> <div class="element-text"> <p>glassy rhyolite<br />glass<br />obsidian</p> </div> </div> </div> </div> </div> </div> </div> felsic glassy vesicle https://wserv3.esc.cam.ac.uk/p1acollections/files/original/f05e63c01d867dcb78bad17121fd1d31.jpg 2d73462e69c78971d66f92dd5d6e622b https://wserv3.esc.cam.ac.uk/p1acollections/files/original/8a6e1a596d0d3bc7ae44e61aab691d56.jpg 84814d5a6509f76521cd808580d14224 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/4b619fdf5cbd3e05bf7ad22b3494cef3.jpg bdc304f5ffbdb6cb553489a47568c9ca 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>L100<br /></strong></h2> <h2>Alkali granite</h2> Subject The topic of the resource <h3>Specimen Age</h3> <p>Variscan , Permo-Carboniferous</p> <h3></h3> Description An account of the resource <h3><span style="font-size:14px;">Hand Specimen</span></h3> <div class="element-set"> <div class="element"> <div class="element-text"> <p>This rock has a<span> </span><a href="/p1acollections/items/show/244">porphyritic</a><span> </span>texture.<span> </span><a href="/p1acollections/items/show/236">Phenocrysts</a><span> </span>of white feldspar up to 30mm long are surrounded by a coarse<span> </span><a href="/p1acollections/items/show/205">groundmass</a><span> </span>of quartz, biotite and white feldspar.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Alkali feldspar (orthoclase)<span> </span><br />- Grains typically 2-4mm long,<span> </span><a href="/p1acollections/items/show/256">subhedral</a><span> </span>to<span> </span><a href="/p1acollections/items/show/173">anhedral</a>, dirty looking due to<span> </span><a href="/p1acollections/items/show/170">alteration</a>. Many display a<span> </span><a href="/p1acollections/items/show/228">microperthite texture</a>.</p> <p>Plagioclase feldspar<span> </span><br />- Grains typically 1-4mm long, subhedral, characteristic<span> </span><a href="/p1acollections/items/show/169">lamellar twinning</a>. Many of the grains look “dirty” under plain polarised light, and have high<span> </span><a href="/p1acollections/items/show/177">birefringence</a><span> </span>speckles under cross-polarised light. They have been partially altered to white mica. Some grains are<span> </span><a href="/p1acollections/items/show/267">zoned</a>.</p> <p>Quartz<span> </span><br />- Grains typically 1-4mm across, anhedral. They are characteristically clean and unaltered when compared with feldspar grains, but do contain many tiny<span> </span><a href="/p1acollections/items/show/210">inclusions</a>.</p> <p>Biotite<span> </span><br />- Grains similar size as the rest of the<span> </span><a href="/p1acollections/items/show/205">groundmass</a>. Strongly<span> </span><a href="/p1acollections/items/show/239">pleochroic</a><span> </span>in pale straw and dark reddish brown. Speckled<span> </span><a href="/p1acollections/items/show/190">extinction</a>. Some sections show the one good<span> </span><a href="/p1acollections/items/show/180">cleavage</a><span> </span>of biotite. Small black blobs and circles are dotted all over the crystals. These are<span> </span><a href="/p1acollections/items/show/238">pleochroic haloes</a>, produced by zircons. Partially decomposed to chlorite.</p> <p>Accessory minerals<span> </span><br />- Apatite<span> </span><br />- Small irregular grains of muscovite mica</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text">This is a coarse-grained rock, which must have cooled slowly as part of an intrusion. Its granitic composition (essential quartz and feldspar) indicates that it was produced in a continental setting.</div> </div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">alkali granite</div> </div> </div> coarse continental felsic inclusions