73225 (4) Impact Melt Breccia
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Fact sheet
Description: 

73225 is a light grey breccia that is equant. It is tough, crystalline, homogeneous, and originally described as a meta-polymict breccia. It contains some large plagioclase feldspar crystals and is most likely to be an impact melt breccia; possibly a granoblastic impactite. A thin vein of black glass penetrates the rock. 73225 was picked from a regolith sample collected from the upper part of a trench wall. It has never been subdivided or allocated. Our thin section is thick so birefringence colours are anomalous.

The sample weighed 3.66 grams before analysis and has not been dated.

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

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Timescale:
Not known
Ma = Millions of years ago
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metamorphic
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