{{Short description|Ultramafic and ultrabasic rock}} {{For|the hydrous aluminium sulfate mineral "websterite"|Aluminite}} [[File:Peridotite Olivine-Orthopyroxene-Clinopyroxene Websterite highlighted.svg|thumb|Websterite highlighted in a ternary diagram]] [[File:Layered Websterite in Basement Sill in McMurdo Dry Valleys in Antarctica.jpg|thumb|Cumulate layers of websterite in the McMurdo Dry Valleys in Antarctica]]
'''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.<ref name="Rogers 2008">{{cite book|last=Rogers|first=Nick|title=An introduction to our dynamic planet|year=2008|publisher=Cambridge Univ. Press|location=Cambridge|isbn=978-0521494243|author2=Stephen Blake |author3=Kevin Burton |author4=Mike Widdowson |author5=Ian Parkinson |author6=Nigel Harris }}</ref>
==References== {{Reflist}} {{Rock type}} Category:Plutonic rocks Category:Ultramafic rocks
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