Anthophyllite

General Information: Chemical Formula:[ ]Mg7Si8O22(OH)2 Composition:(Molecular Weight = 780.82 gm)Magnesium 21.79 % MgSilicon 28.78 % SiHydrogen 0.26 % H Oxygen 49.18 % O  Empirical Formula: Mg7(Si8O22)(OH)2 Environment:Metamorphic rocks. IMA Status:Approved IMA 1978 Locality:Bodenmais, Germany. Montana, USA. Name Origin:From the Latin anthophyllum - "clove" in allusion to the color.Physical Properties: Cleavage:[110] Perfect, [???] Distinct, [???] Distinct Color:white, greenish gray, green, clove brown, or brownish green. Density:2.85 - 3.57, Average = 3.21 Diaphaniety:Transparent to translucent Habits:Fibrous - Crystals made up of fibers., Lamellar - Thin laminae producing a lamellar structure., Massive - Uniformly indistinguishable crystals forming large masses. Hardness:5-6 - Between Apatite and Orthoclase Luminescence:Non-fluorescent. Luster:Vitreous - Pearly Streak:grayMore details...

Atomic Mass : 231.03588Atomic Number : 91Name Origins: Greek, protos = "first."Year Discovered : 1917Discovery Credits : Discovered by Otto Hahn and Lise Meitner at Berlin, by K. Fajans at Karlsruhe, Germany, and by F. Soddy, J. A. Cranston, and A. Fleck at Glasgow, Scotland.More Details

Atomic Mass : 231.03588Atomic Number : 91Name Origins: Greek, protos = "first."Year Discovered : 1917Discovery Credits : Discovered by Otto Hahn and Lise Meitner at Berlin, by K. Fajans at Karlsruhe, Germany, and by F. Soddy, J. A. Cranston, and A. Fleck at Glasgow, Scotland.More Details

(Mg,Fe)7Si8O22(OH)2