15608 (6) Unusual Basalt
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Fact sheet
Description: 

15608 was collected by rake from the rim of Hadley Rille. It is a basalt with unusual texture interpreted as the result of rapid cooling at the edge of a lava flow. It consists of numerous skeletal pigeonite microphenocrysts in a finer-grained variolitic groundmass of pyroxene, plagioclase and opaque minerals. One edge of the particle is a beautiful example of “comb layering”. Fine parallel crystals of pyroxene project towards the edge (rotation 2). Beautiful radial clusters have formed around nucleation centres. There are clusters of olivine crystals in the centre (rotation 1).

The sample weighed 1.2 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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