73275 (69) Micropoikilitic Impact Melt Breccia
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Fact sheet
Description: 

73275 is an impact melt breccia with fine-grained poikilitic matrix and minor vesicularity. It has also been described as a recrystallized breccia with large clasts of plagioclase (0.3-1.0 mm), orthopyroxene (0.1-0.2 mm) and smaller olivine (0.05-0.2 mm). The pyroxene has wide exsolution lamellae indicating prolonged annealing at high temperature. Metallic iron, troilite and cohenite are important accessory minerals. Examples of lithic clasts and mineral clasts (mainly plagioclase feldspar) are shown in rotation 1 and 2 respectively.

The sample weighed 429.6 grams before analysis and has been dated at 3.96 ± 0.05 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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