websterite

{{Short description|Ultramafic and ultrabasic rock}}

{{For|the hydrous aluminium sulfate mineral "websterite"|Aluminite}}

File:Peridotite Olivine-Orthopyroxene-Clinopyroxene Websterite highlighted.svg]]

File:Layered Websterite in Basement Sill in McMurdo Dry Valleys in Antarctica.jpg 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.{{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 }}