Jouravskite

General Information: Chemical Formula:Ca3Mn++++(SO4,CO3)2(OH)6·12(H2O) Composition:(Molecular Weight = 667.50 gm)Calcium 18.01 % CaManganese 8.23 % MnHydrogen 4.53 % H Carbon 0.90 % C Sulfur 7.21 % S Oxygen 61.12 % O  Empirical Formula: Ca3Mn4+(SO4)1.5(CO3)0.5(OH)6·12(H2O) IMA Status:Approved IMA 1965Physical Properties: Cleavage:[100] Good Color:green orange or greenish yellow. Density:1.95 Diaphaniety:Transparent Hardness:2.5 - Finger Nail Luster:Vitreous (Glassy) Streak:greenish whiteMore details...

Ca6Mn2(SO4,CO3)4(OH)12 26(H2O)