12020 (11) - Olivine basalt
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Fact sheet
Description: 

12020 is an olivine basalt with large rounded olivine phenocrysts and elongate pyroxene crystals set in a variolitic groundmass of thin clinopyroxene and plagioclase laths. It has also been described as a medium-grained olivine microgabbro consisting mainly of clinopyroxene, plagioclase and olivine. The clinopyroxene occurs as subhedral laths, up to several mm in length, as smaller anhderal grains, and as very thin, lathlike, crystals interleaved with plagioclase laths.

The sample weighed 255 grams before analysis and is 3.20±0.03 billion years old (Ar/Ar age). 

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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