12038 (64) - Feldspathic basalt
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Fact sheet
Description: 

Lunar basalt 12038 is distinctly different from the other Apollo 12 basalts. It has more feldspar, higher sodium and aluminium, higher REE and is characterized by a distinct isotopic composition. The texture of 12038 is hypidiomorphic and dominantly equigranular (~0.6 mm). Plagioclase laths form a loose, randomly oriented network in which pyroxene is either interstitial or partially enclosed. Also present is acicular ilmenite, interstitial cristobalite, trace Ca-phosphate, fayalite, ulvöspinel, K-feldspar, troilite, K-glass and metallic iron. It also contains a few % vesicles.

The sample weighed 746 grams before analysis and is 3.35±0.09 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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Ma = Millions of years ago
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igneous
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