Ahlfeldite

General Information: Chemical Formula:(Ni,Co)SeO3·2(H2O) Composition:(Molecular Weight = 221.74 gm)Cobalt 6.64 % CoNickel 19.85 % NiHydrogen 1.82 % H Selenium 35.61 % SeOxygen 36.08 % O  Empirical Formula: Ni0.75Co0.25(SeO3)·2(H2O) Locality:TL: Bolivia, Potos¡, ColquechacaPhysical Properties: Cleavage:[110] Distinct, [103] Distinct Color:pink brown, apple green, or red. Density:3.37 Diaphaniety:Transparent Hardness:2-2.5 - Gypsum-Finger Nail Luster:Vitreous (Glassy) Streak:light greenMore details...