12004 (11) - Olivine basalt
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Fact sheet
Description: 

12004 is a porphyritic olivine basalt with small olivine and pyroxene phenocrysts set in a fine-grained variolitic groundmass. It contains approximately equal amounts of larger clinopyroxene and olivine crystals, from 0.5 mm to several mm in size, which together compose about 40% of the rock. The groundmass (60%) consists chiefly of finer-grained plagioclase and pyroxene with pronounced variolitic textures. Ilmenite, chromite, troilite and metallic iron are the opaque phases. 

The sample weighed 585 grams before analysis and has been dated at 2.94±0.11 billion years by one author and 3.29±0.11 billion years by another.

Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/

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Ma = Millions of years ago
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igneous
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