Erionite

General Information: Chemical Formula:(K2,Na2,Ca,Mg)2[Al4Si14O36]·15(H2O) Environment:Occurs in volcanic and sedimentary rocks. Common in altered silicic tuff., especially in saline lacustrine deposits. Locality:Durkee opal mine, Suayze Creek, near Durkee, Baker Co., Oregon, USA. Name Origin:From the Greek for wool, in allusion to its white, fibrous, wool-like appearance.Physical Properties: Cleavage:[010] Distinct Color:white, green, gray, or orange. Density:2.09 - 2.13, Average = 2.11 Diaphaniety:Transparent to translucent Habits:Acicular - Occurs as needle-like crystals., , Hardness:3.5-4 - Copper Penny-Flourite Luminescence:Non-fluorescent. Luster:Vitreous - Silky Streak:whiteMore details...

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...

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...

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...