15683 (8) Olivine Basalt
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Fact sheet
Description: 

15683 was collected with 15674, 15675, 15676 and 15678 in a rake sample. Compositionally they are all samples of fine-grained olivine basalt and they include relict partially-resorbed phenocrysts of olivine. The dominant phase, pyroxene, occurs as small granular grain enclosed in and interstitial to plagioclase laths (subophitic texture). A few phenocrysts of pyroxene are also found. Small olivine phenocrysts have embayed margins and clearly reacted with the liquid during later crystallization. Opaque minerals occur in clumps. Metallic iron and troilite are also present.

The sample weighed 22 grams before analysis and has been dated at 3.36±0.05 billion years (Ar/Ar).

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

Part of our thin section is slightly thick, particularly around the olivine shown in rotation 2.

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