15117 (2) Pigeonite Basalt
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Fact sheet
Description: 

15117 is a coarse-grained pigeonite basalt similar to 15115 and 15116 which was collected as a small fragment in a rake sample. Pyroxene forms chemically-zoned, bladed crystals intergrown with laths of plagioclase feldspar. Many plagioclase crystals have hollow cores. Pyroxene and plagioclase compose nearly 90% of the rock. The sample contains no olivine. Accessory minerals include ilmenite, metallic iron and troilite.

The sample weighed 23.3 grams before analysis and has been dated at 3.35±0.04 billion years (Rb/Sr).

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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