Challacolloite
Comments: White to transparent challacolloite crystals on matrix. Location: Eruption of 1855, Mount Vesuvius, Campania, Italy. Scale: See Image. © Jeff Weissman / Photographic Guide to Mineral Species
GRapi = 77.53 (Gamma Ray American Petroleum Institute Units) Concentration of Challacolloite per GRapi unit = 1.29 (%)
Estimated Radioactivity from Challacolloite - barely detectable
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