Websterite

Websterite
Composition
Igneous rock
Cumulate layers of websterite in the McMurdo Dry Valleys in Antarctica.
Classification	Ultramafic
Primary	clinopyroxene and orthopyroxene
Secondary	olivine, hornblende, spinel, chromite, garnet, anorthite
Texture	Phaneritic

Websterite is ultramafic igneous rock, a type of pyroxenite that has less than 5% olivine and roughly equal proportions of orthopyroxene and clinopyroxene.

Websterite is named after the town Webster in North Carolina.^[1]

References

[edit]

↑ Rogers, Nick; Stephen Blake; Kevin Burton; Mike Widdowson; Ian Parkinson; Nigel Harris (2008). An introduction to our dynamic planet. Cambridge: Cambridge Univ. Press. ISBN 978-0521494243.

Common igneous rocks classified by silicon dioxide content

Type	Ultramafic <45% SiO₂	Mafic 45–52% SiO₂	Intermediate 52–63% SiO₂	Felsic >63% SiO₂
Volcanic rocks: Subvolcanic rocks: Plutonic rocks:	Komatiite Kimberlite Peridotite	Basalt Diabase (Dolerite) Gabbro	Andesite Microdiorite Diorite	Rhyolite Microgranite Granite

v t e Types of rocks
Igneous rock	Andesite Icelandite Boninite Sanukite Anorthosite Appinite Aplite Basalt Alkali basalt Picrite basalt Basaltic trachyandesite Mugearite Shoshonite Basanite Blairmorite Carbonatite Natrocarbonatite Sovite Charnockite Enderbite Dacite Adakitic dacite Diabase Diorite Napoleonite Foidolite Ijolite Gabbro Troctolite Norite Hornblende gabbro Granite Alkali feldspar granite Monzogranite Leucogranite Granodiorite Granophyre Hornblendite Hyaloclastite Komatiite Lamproite Lamprophyre Monzonite Larvikite Quartz monzonite Monzogabbro Essexite Nepheline syenite Borolanite Nephelinite Obsidian Pegmatite Peridotite Wehrlite Dunite Harzburgite Lherzolite Hornblende peridotite Kimberlite Phonolite Phonotephrite Pumice Pyroxenite Websterite Clinopyroxenite Orthopyroxenite Quartz diorite Quartzolite Rhyodacite Rhyolite Comendite Pantellerite Scoria Reticulite Shonkinite Sideromelane Syenite Tachylite Tephriphonolite Tephrite Tonalite Trondhjemite Trachyandesite Benmoreite Latite Trachybasalt Hawaiite Trachyte Tuff Ignimbrite
Sedimentary rock	Banded iron formation Breccia Chert Flint Coal Lignite Anthracite Conglomerate Diamictite Diatomite Dolomite Evaporite Geyserite Jaspillite Laterite Limestone Calcarenite Chalk Coquina Lumachelle Marl Oolite Travertine Tufa Wackestone Mudstone Argillite Claystone Shale Siltstone Oil shale Phosphorite Sandstone Arkose Greywacke Gritstone Itacolumite Sylvinite Tillite Turbidite Varve
Metamorphic rock	Amphibolite Blueschist Cataclasite Corundite Eclogite Epidosite Gneiss Granulite Greenschist Hornfels Calcflinta Itabirite Jadeitite Lapis lazuli Litchfieldite Marble Migmatite Mylonite Metapelite Phyllite Pseudotachylite Quartzite Schist Serpentinite Skarn Slate Suevite Talc carbonate Soapstone Tectonite Tektite Moldavite Whiteschist
Specific varieties	Ganister Gossan Jasperoid Kenyte Larvikite Litchfieldite Llanite Luxullianite Mangerite Novaculite Pyrolite Rapakivi granite Rhomb porphyry Rodingite Taconite Teschenite Theralite Unakite Variolite Wad
Non-terrestrial rocks (meteorites)	Achondrite Primitive achondrite Asteroidal achondrite Lunar meteorite Martian meteorite Chondrite Carbonaceous chondrite Enstatite chondrite Ordinary chondrite Rumurutiite Iron meteorite Stony-iron meteorite Mesosiderite Pallasite

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References