77075 (11) Impact Melt Dyke in Cataclastic Norite
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Fact sheet
Description: 

77075 was sampled from one of the dark dykes within a large, off-white “noritic” clast. The dyke is about 3 cm thick, and has portions of the white clast attached on both sides. The holocrystalline matrix is a fine-grained intergrowth of sub-ophitic plagioclase and pyroxene, with minor olivine and ilmenite. A few percent mineral and lithic clasts are also present.

The sample weighed 172.4 grams before analysis and has been dated at 3.98±0.03 billion years (Ar/Ar).

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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