Bartonite

General Information: Chemical Formula:K3Fe10S14 Composition:(Molecular Weight = 1,124.69 gm)Potassium 10.43 % K Iron 49.66 % FeSulfur 39.92 % S  Empirical Formula: K3Fe2+10S14 IMA Status:Approved IMA 1978 Locality:Coyote Peak diatreme, 16 miles SW of Orick, Humboldt Co. California.Physical Properties: Cleavage:[112] Distinct Color:black brown. Density:3.305 Diaphaniety:Opaque Hardness:3.5 - Copper Penny Luster:Metallic Streak:blackMore details...