Orthopyroxenite is an ultramafic and ultrabasic rock that is almost exclusively made from the mineral orthopyroxene, the orthorhombic version of pyroxene and a type of pyroxenite. It can have up to a few percent of olivine and clinopyroxene. Orthopyroxenites can also occur on other planets. ALH 84001 is a Martian meteorite that can be classified a...
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http://en.wikipedia.org/wiki/Orthopyroxenite
A type of Mars meteorite that is currently represented by only one known specimen, ALH 84001, which was found in the Allan Hills region of Antarctica in 1984. It is a cumulate rock consisting of 97% coarse-grained, magnesium-rich orthopyroxene, with small amounts of plagioclase, chromite, and carbon...
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http://www.daviddarling.info/encyclopedia/O/orthopyroxenite.html
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