60636 (6) KREEP Breccia
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Fact sheet
Description: 

60626 is a KREEP breccia that was collected as a rake sample near the Lunar Module. Our thin section shows two lithologies, one grey and with visible clasts of plagioclase, the second brown and much finer grained (devitrified glass?). Troilite and metallic iron are relatively common (but minor) constituents in the coarser lithology.

The sample weighed 35.7 grams before analysis and has been dated at 3.94 billion years by the U-Th-Pb method.

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

Our thin section image shows a sequence of numbers (1-5) that have been scribed on the glass behind the five rock fragments. In places the thin section is thick so between crossed polars some plagioclase crystals are yellow instead of shades of grey.

[KREEP is an acronym built from the letters K (the atomic symbol for potassium), REE (Rare Earth Elements) and P (for phosphorus). It is a geochemical component of some lunar impact breccia and basaltic rocks]

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Not known
Ma = Millions of years ago
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metamorphic
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