72536 (8) Impact Melt Breccia
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Fact sheet
Description: 

72536 (and its companion 72535) has a texture characteristic of a fine-grained, clast-bearing impact melt rather typical of the Apollo 17 highland breccias. It has a dark porous basaltic-textured groundmass, with plagioclase laths less than 30 microns long, sub-ophitically enclosed by irregular mafic crystals. Ca-plagioclase is the major mineral clast. Small lithic clasts make up about ~5 % of the sample. Rotation 1 shows mineral and lithic clasts and rotation 2 shows a polygonised anorthosite clast.

The sample weighed 52.3 grams before analysis and has not been dated.

Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/

Note: in places this thin section is slightly thick.

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Timescale:
Not known
Ma = Millions of years ago
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metamorphic
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