Wightmanite

General Information: Chemical Formula:Mg5(BO3)O(OH)5·2(H2O) Composition:(Molecular Weight = 376.21 gm)Magnesium 32.30 % MgBoron 5.75 % B Hydrogen 2.41 % H Oxygen 59.54 % O  Empirical Formula: Mg5(BO3)O(OH)5·2(H2O) Environment:Metamorphosed limestone. IMA Status:Approved IMA 1962 Locality:Crestmore Quarry, 5 miles NW of Riverside, Riverside Co., California.Physical Properties: Cleavage:[010] Perfect, [100] Distinct Color:colorless or light green. Density:2.6 Diaphaniety:Transparent Hardness:5.5 - Knife Blade Luster:Vitreous (Glassy) Streak:whiteMore details...

Mg5(BO3)O(OH)4 2(H2O)