12063 (15) - Ilmenite basalt
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Fact sheet
Description: 

12063 is the largest sample and has the highest ilmenite content of the Apollo 12 basalts. It is believed to have been collected at Bench Crater together with 12039. 12063 is a medium-grained porphyritic olivine, pyroxene basalt. Phenocrysts of rounded olivine (0.6 to 0.8 mm) and euhedral to subhedral pyroxene (0.3 to 1.5 mm) are set in a matrix of intergrown plagioclase, pyroxene and opaque minerals. Mesostasis fill intersticies between matrix minerals and consists of vermicular, perhaps eutectric intergrowths, of single clinopyroxene crystals and glass. Pigeonite and augite ophitically enclose laths of polysynthetically twinned plagioclase. Small amounts of fayalite, cristobalite, and glass are associated in areas interstitial to pyroxene and plagioclase. The opaque minerals consist predominantly of ilmenite with lesser amounts of spinel, troilite, mackinawite (?), metallic iron and metallic Cu.

The sample weighed 2426 grams before analysis and is 3.30±0.13 billion years old (Rb-Sr).

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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