12022 (11) - Ilmenite basalt
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Fact sheet
Description: 

Sample 12022 is medium-grained porphyritic Mare basalt collected during the Apollo 12 mission. The sample has been dated at 3.2 billion years and was probably brought to the surface of the Moon by a meteorite impact 200 million years ago.

The thin section contains phenocrysts of olivine and pyroxene (augite and pigeonite). The groundmass consists of feathery intergrowths of plagioclase feldspar, ilmenite, pyroxene and a small amount of glass. Ilmenite has an interesting cross-cutting, parallel, skeletal habit. Accessory minerals include chromite, ulvospinel and metallic iron. 

A large piece of 12022 is on public display in the National Museum of Wales, Cardiff. 

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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