73235 (58) Aphanitic Impact Melt Breccia
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Fact sheet
Description: 

73235 has a dense, aphanitic melt groundmass with seriate clast distribution. The groundmass consists mainly of plagioclase, pyroxene, opaque minerals and rare pleonaste spinel. Lithic clasts include granoblastic feldspathic impactities with a variety of grain sizes, shocked anorthosites, and cataclastic troctolites and norites. Many lithic clasts are strung out as schlieren within the dense matrix. An area subjected to cataclastic deformation is shown in rotation 2. Numerous zircons are found in 73235 and pink spinel is also reported.

The sample weighed 878.3 grams before analysis and has been dated at 3.98±0.04 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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