Sodicanthophyllite

General Information: Chemical Formula:NaMg7Si8O22(OH)2 Composition:(Molecular Weight = 803.81 gm)Sodium 2.86 % NaMagnesium 21.17 % MgSilicon 27.95 % SiHydrogen 0.25 % H Oxygen 47.77 % O  Empirical Formula: NaMg7(Si8O22)(OH)2 IMA Status:Approved IMA 1978 Name Origin:From its compostition and from the Latin anthophyllum - "clove" in allusion to the color.Physical Properties: Color:green or brown. Hardness:5-6 - Between Apatite and OrthoclaseMore details...