12009 (11) - Olivine basalt
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Fact sheet
Description: 

Sample 12009 is an olivine vitrophyre collected during the Apollo 12 mission to the Moon. The rock is rapidly-cooled basalt that formed skeletal crystals in a glass matrix. The sample has been dated at 3.2 billion years, but it was brought to the surface by a meteorite impact much more recently since it has a cosmic ray exposure age of 136 million years.

In thin section, the sample consists of skeletal phenocrysts of olivine (0.3-1.0 millimetres) and pyroxene (0.2-0.8 millimetres) set in a matrix of microcrystalline devitrified glass and small crystals of olivine, pyroxene and ilmenite that crystallised from the melt.

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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