66075 (64) Ancient Regolith Breccia
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Fact sheet
Description: 

66075 is one of many coherent, light matrix breccias from Apollo 16 and has about equal amounts of both dark and light aphanitic clasts. The groundmass is coherent, porous (20%), unsorted and seriate and made of angular fragments of plagioclase and other minerals along with lithic and glass fragments. Plagioclase and devitrified maskelynite constitute the majority of the groundmass, followed in abundance by aphanitic material and glass. At least some of the glass is agglutinate. It is a highland regolith breccia. Clasts include anorthosite, gabbroic anorthosite, noritic anorthosite, basalt and troctolite.

The sample weighed 347 grams before analysis. Clasts have been dated at 3.83 to 4.08 billion years (Ar/Ar).

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

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Not known
Ma = Millions of years ago
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metamorphic
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