View of Apollo 16 lunar sample no. 60315 A closeup view or "mug shot" of Apollo 16 lunar sample no. 60315, one of the most dense and hardest rocks collected during Apollo 16. The sample was picked up near the end of the mission's third and final extravehicular activity (EVA-3). It has a very fine-grained grondmass in which larger, lathshaped, white feldspar crystals are embedded. Immediately after sample return, this rock was investigated for short-lived isotopes caused by solar flares.
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