15647 (6) Olivine Basalt
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Fact sheet
Description: 

15647 is a relatively large, relatively coarse-grained olivine basalt. It consists of anhedral olivine (<1mm), small granular pyroxene crystals and some granular olivine. Plagioclase forms laths up to 2mm long that are ragged and poikilitically enclose small mafic phases. The olivine phenocrysts appear optically unzoned, generally, and a few contain quenched silicate liquid inclusions. Chromite is present in the olivine, but ulvospinel is the dominant opaque phase. Ilmenite, cristobalite (see small crystal at centre of rotation 2), glass, fayalite and troilite form the residium. This and other olivine-phyric rocks are derived from the rapidly cooled, near surface part of a lava flow.

The sample weighed 58.2 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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Not known
Ma = Millions of years ago
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igneous
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