Wiserite

General Information: Chemical Formula:Mn4B2O5(OH,Cl)4 Composition:(Molecular Weight = 398.62 gm)Manganese 55.13 % MnBoron 5.42 % B Hydrogen 0.88 % H Chlorine 4.45 % ClOxygen 34.12 % O  Empirical Formula: Mn2+4B2O5(OH)3.5Cl0.5Physical Properties: Cleavage:None Color:white, brownish, reddish, or pinkish brown. Density:3.42 - 3.54, Average = 3.48 Diaphaniety:Transparent Hardness:2.5 - Finger Nail Luster:Vitreous - Silky Streak:whiteMore details...

(Mn,Mg)14B8(Si,Mg)O22(OH)10Cl