60018 (52) Polymict Breccia
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Fact sheet
Description: 

60018 was broken off of a corner of a 40 cm boulder. The most obvious feature in thin section is the highly shocked plagioclase feldspar (rotations 1 & 2). In places the texture is variolitic and probably represents recrystallised impact melt in which a second generation of plagioclase feldspar forms almost needle-like crystals. The reflected light view shows significant metallic iron and troilite is present.

The sample weighed 1501 grams before analysis and has not been dated with certainty.

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

Our thin section is slightly thick so between crossed polars some plagioclase crystals are yellow instead of shades of grey.

In Place
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Timescale:
Not known
Ma = Millions of years ago
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Type: 
metamorphic
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