12008 (41) - Olivine vitrophyre basalt
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Fact sheet
Description: 

12008 is an olivine vitrophyre containing ~15-20% equant subhedral to euhedral phenocrysts of olivine (0.2 -0.5 mm) heterogeneously distributed in the opaque groundmass as glomerophyric aggregates. Small chromite grains with attached Fe-Ni metal grains are found in the groundmass or attached to the rims of the olivine phenocrysts. Olivine includes spherical melt inclusions. A second generation of olivine occurs as chains of skeletal microphenocrysts. The fine-grained opaque matrix is made of microlites of aluminous titanaugite, ilmenite and plagioclase.

The sample weighed 58.4 grams before analysis and is about 3.2 billion years old.

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

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Not known
Ma = Millions of years ago
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igneous
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