Ferriwinchite
Comments: Deep black-blue bladed single ferriwinchite crystals embedded in white dolomite. Location: Imerina, Madagascar. Scale: See Image. © Rruff Database
GRapi = 5.92 (Gamma Ray American Petroleum Institute Units) Concentration of Ferriwinchite per GRapi unit = 16.88 (%)
Estimated Radioactivity from Ferriwinchite - barely detectable
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