Check out this remarkable example of skeletal galena - a 1.7-cm crystal whose bizarre form you can see deeply into; on its backside is a gleaming chalcopyrite crystal, and on top of that, a cute little skeletal galena! The galenas and chalcos here are on a bed of milky quartz crystals.
Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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