websterite
Sign in to savethumb|Websterite highlighted in a ternary diagram thumb|Cumulate rock|Cumulate layers of websterite in the [[McMurdo Dry Valleys in Antarctica]]
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thumb|Websterite highlighted in a ternary diagram thumb|Cumulate rock|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.
Excerpted from Wikipedia’s “websterite” article, available under the CC BY-SA 4.0 licence.