12035 (68) - Olivine basalt
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Fact sheet
Description: 

12035 is a friable, vuggy, micro-gabbro with euhedral to subhedral chrome spinel and olivine, and subhedral to anhedral clinopyroxene enclosed by poikilitic plagioclase. Interstitial ilmenite tends to be anhedral. The sample has also been described as a coarse olivine-rich (30%) gabbro with euhedral clinopyroxene, subhedral olivine and large plagioclase grains. The olivine is relatively iron rich, hence it is not a simple cumulate for the other olivine basalts, but rather the olivine has re-equilibrated with the liquid. Olivine phenocrysts in 12035 contains melt inclusions. Plagioclase crystals (~1 mm) are larger than those in other Apollo 12 olivine basalts.

The sample weighed 71 grams before analysis and is 3.2 billion years old (Rb-Sr).

The large plagioclase crystals in this sample appear to contain many colourless spherical inclusions. These are probably artifacts introduced as the embedding resin changed over time. The thin section is nearly 50 years old.

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

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Timescale:
Not known
Ma = Millions of years ago
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igneous
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