Article · Wikipedia archive · Last revised Jun 1, 2026

Websterite

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

Last revised
Jun 1, 2026
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≈ 1 min
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Websterite highlighted in a ternary diagram source ↗
Cumulate layers of websterite in the McMurdo Dry Valleys in Antarctica source ↗

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

References

  1. 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.