15666 (8) Porphyritic Pigeonite Basalt
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Fact sheet
Description: 

15666 was collected as part of the large rake sample. Pigeonite phenocrysts dominate the mineral assemblage. They are euhedral, elongate and chemically zoned, with distinct boundaries (see rotations 1 and 2). Vesicles, ilmenite, metallic iron and tiny troilite grains are also present. The groundmass is finely crystalline and consists of elongate crystals of pyroxene and plagioclase with minor olivine. 15666 was rapidly cooled.

The sample weighed 10.1 grams before analysis and has not been dated.

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: 
igneous
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