Wallkilldellite

General Information: Chemical Formula:Ca4Mn++6As+++++4O16(OH)8·18(H2O) Composition:(Molecular Weight = 1,505.95 gm)Calcium 10.65 % CaManganese 21.89 % MnArsenic 19.90 % AsHydrogen 2.94 % H Oxygen 44.62 % O  Empirical Formula: Ca4Mn2+6As4O16(OH)8·18(H2O) IMA Status:Approved IMA 1983Physical Properties: Cleavage:[0001] Perfect Color:dark red. Density:2.85 Hardness:3 - Calcite Luster:Vitreous (Glassy) Streak:light orangeMore details...

General Information: Chemical Formula:(Ca,Cu)4Fe6[(As,Si)O4]4(OH)8 Composition:(Molecular Weight = 1,163.76 gm)Calcium 10.33 % CaIron 28.79 % FeCopper 5.46 % CuSilicon 2.41 % SiArsenic 19.31 % AsHydrogen 0.69 % H Oxygen 33.00 % O  Empirical Formula: Ca3CuFe2+6(AsO4)3(SiO4)(OH)8 Environment:The Fe++ dominant analog of wallkilldellite. IMA Status:Proposed IMA 1998 (Dana # Added) Name Origin:Commission on New Minerals and Mineral Names.Physical Properties: Color:brownish yellow. Diaphaniety:Translucent Luster:Vitreous - ResinousMore details...