A magnesium-rich basalt retrieved by the Apollo 12 mission from the Moon. brightly coloured pyroxene and olivine surround grey plagioclase in cross-polars.
This photo was taken in 2003 from a travelling collection of thin sections sponsored by NASA.
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RE: https://fosstodon.org/@silicatefondue/115582907581650722
Mondgestein ist bunt!
(Polarisationsmikroskopie mit mehreren Mineralphasen ist immer bunt, aber auch immer schön. 💚)