Ogdensburgite

General Information: Chemical Formula:Ca2(Zn,Mn)Fe+++4(AsO4)4(OH)6·6(H2O) Composition:(Molecular Weight = 1,132.66 gm)Calcium 7.08 % CaManganese 0.97 % MnZinc 4.62 % ZnIron 19.72 % FeArsenic 26.46 % AsHydrogen 1.60 % H Oxygen 39.55 % O  Empirical Formula: Ca2Zn0.8Mn2+0.2Fe3+4(AsO4)4(OH)6·6(H2O) Environment:Secondary Fe arsenate. IMA Status:Approved IMA 1981 Locality:Sterling Hill mine, Ogdensburg, New Jersy, USA. Name Origin:Named for the locality.Physical Properties: Cleavage:[001] Perfect, [010] Fair, [100] Poor Color:brownish red, dark brown, or reddish orange. Density:2.92 - 3.11, Average = 3.01 Diaphaniety:Translucent Habits:Bladed - Aggregates of thin lath-like crystals (e.g. kyanite)., Encrustations - Forms crust-like aggregates on matrix., Micaceous - Platy texture with "flexible" plates. Hardness:2 - Gypsum Luminescence:Non-fluorescent. Luster:Resinous Streak:brown yellowMore details...