15085 (19) Pigeonite Basalt
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Fact sheet
Description: 

15085 is a coarse-grained mare basalt dominated by pigeonite. Pyroxene and plagioclase compose 90% of the rock. Pyroxene is dominant, occurring both as large phenocrysts and sub-ophitically intergrown with plagioclase laths. It zones outward to pyroxferroite and is often beautifully twinned and zoned. Accessories include cristobalite, tridymite (large lath in rotation 2), ilmenite, spinel, metallic iron, troilite and fayalite (pale green crystal cluster in rotation 1). 

The sample weighed 400.5 grams before analysis and has been dated at 3.35±0.04 billion years (Ar/Ar).

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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