Erdite

General Information: Chemical Formula:NaFeS2·2(H2O) Composition:(Molecular Weight = 179.00 gm)Sodium 12.84 % NaIron 31.20 % FeHydrogen 2.25 % H Sulfur 35.83 % S Oxygen 17.88 % O  Empirical Formula: NaFe2+S2·2(H2O) IMA Status:Approved IMA 1977 Locality:Coyote Peak diatreme, 16 miles SW of Orick, Humboldt Co. California.Physical Properties: Cleavage:[110] Good Color:copper red, red, or black. Density:2.3 Diaphaniety:Opaque Hardness:2 - Gypsum Luster:Metallic Streak:blackMore details...