10023 - Regolith breccia
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Fact sheet
Description: 

Sample 10023 is a coherent regolith breccia with many micrometeorite pits on the top, rounded surface. It was collected as part of the contingency sample and returned in air with the crew to the lunar receiving laboratory at NASA.

Detailed investigations reveal that 10023 contains: mare basalt fragments, lunar highland fragments (anorthosite), regolith breccia, agglutinates, clasts of pyroxene, olivine, plagioclase feldspar, ilmenite, orange glass and other glass, all cemented by a dark matrix (about 40% of the rock is matrix). The glass has been divided into different types: heterogeneous, homogeneous, devitrified and glass-welded aggregates. 27% of the sample is pore space. Additionally, in reflected light, rare small yellow crystals of troilite and silvery metallic iron can be seen.

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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