76335 (49) Cataclastic Magnesian Anorthosite
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Fact sheet
Description: 

76335 is a highly shocked anorthosite. It contains an orthopyroxene­ dominated assemblage which includes orthopyroxene, olivine, highly crushed plagioclase feldspar, chromite, phosphate and a new lunar mineral keiviite-Y. Merrillite, baddeleyite and zirkelite have also been reported.

This thin section has been used by researchers and shows residual carbon coating in fractures and what appear to be laser trails (black lines) crossing the sample.

The sample weighed 503 grams before analysis and is 4.28±0.06 billion years old (Sm/Nd).

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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metamorphic
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