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Kerstenite: PbSeO4 (?) Clinochalcomenite: CuSeO3·2(H2O) Krutaite: CuSe2
Comments: Tan opaque fibrous kerstenite with possible blue clinochalcomenite on dark krutaite. Location: Mina El Dragon, Potosi, Bolivia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species