12011 (22) - Pigeonite basalt
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Fact sheet
Description: 

12011 is a porphyritic pigeonite basalt. Phenocrysts of olivine (1 mm) and pyroxene (up to 4 mm long) and microphenocrysts of chromite occur in a fine-grained, variolitic-textured groundmass of pyroxene, plagioclase, ilmenite, chromite, metallic iron and mesostasis. Olivine crystals are compositionally zoned. Pyroxene consists of pigeonite cores rimmed by augite. Some pigeonite phenocrysts are long and “hollow”.

The sample weighed 193 grams before analysis. It has not been dated.

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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