73155 (28) Catastrophic-ruptured Breccia
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Fact sheet
Description: 

73155  is part of the “light mantle” deposit. The interest in 73155 is related to two prominent micrometeorite craters that nearly ruptured the rock. The rock is a collection of clasts of plutonic rocks, cemented together with a feldspathic melt with poikilitic texture. There are numerous plagioclase clasts and a prominent gabbroic clast (see rotation 2) in the matrix. Rotation 1 shows a polygonised, plagioclase feldspar-rich clast.

The sample weighed 79.3 grams before analysis and has been dated at 3.90-3.94±16 billion years (Ar/Ar).

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

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