15678 (6) Olivine Basalt
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Fact sheet
Description: 

15678 was collected with 15674, 15675, 15676 and 15683 in a rake sample. Compositionally they are all samples of fine-grained olivine basalt and they include relict partially-resorbed phenocrysts of olivine. The dominate phase, pyroxene, occurs as small granular grain enclosed in and interstitial to plagioclase laths (subophitic texture). A few phenocrysts of pyroxene are also found (see rotation 1). 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 7.5 grams before analysis and has been dated at 3.38±0.05 billion years (Ar/Ar).

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

The mounting resin of this thin section has deteriorated over time and now contains clusters of colourful dendrites (obvious in reflected light) within and around the thin section.

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Not known
Ma = Millions of years ago
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igneous
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