15076 (72) Pigeonite Basalt
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Fact sheet
Description: 

15076 is a coarse-grained porphyritic pigeonite basalt with subophitic matrix. 15075 is a sister sample. Pyroxene and plagioclase compose 90% of the rock. Pyroxene is dominant, occurring both as large phenocrysts and subophitically intergrown with plagioclase laths in between. It zones outward to pyroxferroite.  Accessories include chromite­, ulvospinel, pyroxferroite, cristobalite, tridymite (large lath in rotation 1, parallel group of needle-shaped crystals in rotation 2), spinel, metallic iron, troilite and fayalite. The pyroxenes are highly zoned and up to 6 mm long.

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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Ma = Millions of years ago
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igneous
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