![]() Basanite - a volcanic rock of mafic composition essentially a silica undersaturated basalt Boninite - a high-magnesian basalt dominated by pyroxene Carbonatite - a rare igneous rock composed of >50% carbonate minerals Charnockite - a type of granite containing pyroxene Enderbite - a variety of charnockite Dacite - a felsic to intermediate volcanic rock with high iron content Diabase or dolerite - an intrusive mafic rock forming dykes or sills Diorite - a coarse grained intermediate plutonic rock composed of plagioclase, pyroxene and/or amphibole Dunite - a phaneritic ultramafic rock composed of more than 90% olivine, usually forsteritic Essexite - a silica undersaturated mafic plutonic rock (essentially a foid-bearing gabbro) Foidolite - a plutonic igneous rock composed of >90% feldspathoid minerals Gabbro - a coarse grained plutonic rock composed of pyroxene and plagioclase basically equivalent to basalt Granite - a coarse grained plutonic rock composed of orthoclase, plagioclase and quartz Granodiorite - a granitic plutonic rock with plagioclase > orthoclase Granophyre - a subvolcanic intrusive rock of granitic composition Harzburgite - a variety of peridotite an ultramafic cumulate rock Hornblendite - a mafic or ultramafic cumulate rock dominated by >90% hornblende Hyaloclastite - a volcanic rock composed primarily of glasses and glassy tuff Icelandite - a volcanic rock Ignimbrite - a fragmental volcanic rock Ijolite - a very rare silica-undersaturated plutonic rock Kimberlite - a rare ultramafic, ultrapotassic volcanic rock and a source of diamonds Komatiite - an ancient ultramafic volcanic rock Lamproite - an ultrapotassic volcanic rock Lamprophyre - an ultramafic, ultrapotassic intrusive rock dominated by mafic phenocrysts in a feldspar groundmass Latite - a silica undersaturated form of andesite Lherzolite - an ultramafic rock, essentially a peridotite Monzogranite - a silica undersaturated granite with 90% nepheline Norite - a hypersthene bearing gabbro Obsidian - a type of volcanic glass Pegmatite - an igneous rock (or metamorphic rock) with giant sized crystals Peridotite - a plutonic or cumulate ultramafic rock composed of olivine and pyroxene Phonolite - a silica undersaturated volcanic rock essentially similar to nepheline syenite Picrite - an olivine-bearing basalt Porphyry - a rock, usually granitic, with a porphyritic texture Pumice - a fine grained, extremely vesicular volcanic rock Pyroxenite - a coarse grained plutonic rock composed of >90% pyroxene Quartz diorite - a diorite with >5% modal quartz Quartz monzonite - an intermediate plutonic rock, essentially a monzonite with 5-10% modal quartz Rhyodacite - a felsic volcanic rock which is intermediate between a rhyolite and a dacite Rhyolite - a felsic volcanic rockĬomendite - a peralkaline rhyolite Pantellerite - an alkaline rhyolite-rhyodacite with amphibole phenocrysts Scoria - an extremely vesicular mafic volcanic rock Sovite - a coarse grained carbonatite rock Syenite - a plutonic rock dominated by orthoclase feldspar a type of granitoid Tachylyte - essentially a basaltic glass Tephrite - a silica undersaturated volcanic rock Tonalite - a plagioclase-dominant granitoid Trachyandesite - an alkaline intermediate volcanic rockīenmoreite - sodic trachyandesite Basaltic trachyandesite Mugearite - sodic basaltic trachyandesite Shoshonite - potassic basaltic trachyandesite Trachyte - a silica undersaturated volcanic rock essentially a feldspathoid-bearing rhyolite Troctolite - a plutonic ultramafic rock containing olivine, pyroxene and plagioclase Trondhjemite - a form of tonalite where plagioclase-group feldspar is oligoclase Tuff - a fine grained volcanic rock formed from volcanic ash Websterite - a type of pyroxenite, composed of clinoproxene and orthopyroxene Wehrlite - an ultramafic plutonic or cumulate rock, a type of peridotite, composed of olivine and clinopyroxene Sedimentary īituminous coal seam in West Virginia File:Limestoneshale7342.jpg Andesite - an Intermediate volcanic rock Anorthosite - an intrusive igneous felsic rock composed predominantly of plagioclase Aplite - a very fine grained intrusive igneous rock Basalt - a volcanic rock of mafic compositionĪdakite - a class of basaltic rocks containing low yttrium and ytterbium Hawaiite - a class of basalts formed from ocean island (hot spot) magmatism. A sample of andesite (dark groundmass) with amygdaloidal vesicules filled with zeolite.
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