Jahnsite-(MnMnMn)

General Information: Chemical Formula:MnMnMn2Fe+++2(PO4)4(OH)2·8(H2O) Composition:(Molecular Weight = 889.47 gm)Manganese 24.71 % MnIron 12.56 % FePhosphorus 13.93 % P Hydrogen 2.04 % H Oxygen 46.77 % O  Empirical Formula: Mn2+Mn2+Mn2+2Fe3+2(PO4)4(OH)2·8(H2O) IMA Status:Approved IMA Locality:Stewart mine, Pala, San Diego County, California, USA. Name Origin:Named for Richard H. Jahns (1915-1983), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA.Physical Properties: Cleavage:None Color:brown, purplish brown, yellow, or yellow orange. Diaphaniety:Transparent to Translucent Hardness:4 - Fluorite Luster:Vitreous - Adamantine Streak:whiteMore details...