76539 (10) Vitrophyric Basalt
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Fact sheet
Description: 

76539 is a small aphanitic basalt found in a rake sample. It contains numerous tiny phenocrysts of skeletal olivine (rotations 1 & 2), patches enriched in pyroxene and fine needles of ilmenite (seen in reflected light). The remainder is “opaque” glass.

The sample weighed 14.8 grams before analysis and has not been dated.

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

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Timescale:
Not known
Ma = Millions of years ago
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Type: 
igneous
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