This is a newly named (1999), extremely rare mineral from Madagascar. Embedded in quartz are sub-metallic, taupe-gray crystals to 2 cm in length. I obtained this in exchange from Dr. Pezzotta, who specializes in the minerals of Madagascar and I think could be safely considered the authority on finely crystallized rarities here. He told me these are among the largest fine crystals known for the species. I certainly have seen nothing comparable on the market, and for that matter you don't see much of it at all on the market.
Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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