12036 (10) - Olivine basalt
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Fact sheet
Description: 

Olivine basalt 12036 looks a lot like 12035 and has the same high modal olivine and pyroxene and the same chemical composition (within sampling error). 12036 is a coarse-grained cumulate containing abundant amounts of olivine, pigeonite, augite and chromite as cumulus phases. The pyroxene is both twinned and compositionally zoned. Olivine poikilitically encloses pyroxene megacrysts up to 5mm in length. 12036 has also been described as a feldspathic peridotite. 

The megacrysts are incorporated into a second stage assemblage of olivine, plagioclase, pyroxene, spinel and accessory minerals. Residual glass with high silica and high potassium is found interstitially and is associated with K-feldspar, fluorapatite, whitlockite and baddeleyite.

The sample weighed 75 grams before analysis. It 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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