15616 (14) Vesicular Olivine Basalt
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Fact sheet
Description: 

15614, 15616, 15620, 15622, 15623 and 15630 are small fragments of vesicular mare basalt which were collected as part of a rake sample. Their chemical composition is that of an olivine-normative basalt, but olivine does not form obvious phenocrysts  (see rotation 2). Pyroxene, olivine and plagioclase form an interlocking network that is peppered by minute opaque minerals; ilmenite and spinel. Small grains of metallic iron and troilite are also present. Vesicles are less than 1mm. Pyroxene is red-brown in colour and chemically zoned.

The sample weighed 8.0 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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