Haiweeite is one of the more attractive of the non-African suite of radioactives containing uranium, and remains a rarity known in good crystals from but a few locales. This is a very rare, hydrated, calcium, uranium, silicate. Extremely colorful and rarely ever seen in dealers stocks. This is a large and rich specimen of the material. It came out about 6 years ago. Tim Blackwood Collection.
Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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{{en|1=Haiweeite, Gypsum (Var.: Gypsum)
:: Locality: Perus, São Paulo, São Paulo, Southeast Region, Brazil