15682 (12) Pigeonite Basalt
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Fact sheet
Description: 

15682 is a typical Apollo 15 pigeonite basalt that was collected as part of a rake sample. Pyroxene phenocrysts are elongate or equant often with hollow cores (infilled later). They are both twinned and chemically zoned (see rotation 1). Spherulitic bundles of plagioclase laths, ilmenite and fine pyroxene crystals occur in the groundmass (see rotation 2). Metallic iron grains, ulvospinel and cristobalite are also reported.

The sample weighed 50.6 grams before analysis and has been dated at 3.44±0.07 billion years (Rb/Sr).

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

The mounting resin of this thin section has deteriorated over time and now contains clusters of colourful dendrites (obvious in reflected light) within and around the thin section.

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Ma = Millions of years ago
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igneous
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