72535 (6) Impact Melt Breccia
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Fact sheet
Description: 

72535 (and its companion 72536) 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. Pink spinel is present as a minor constituent. Rotation 1 shows mineral and lithic clasts and rotation 2 mainly shows a maskelynitised feldspar clast.

The sample weighed 221.4 grams before analysis and has been dated at 3.8874±0.016 billion years (Ar/Ar).

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

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Ma = Millions of years ago
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metamorphic
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