Adelite

General Information: Chemical Formula:CaMg(AsO4)(OH) Composition:(Molecular Weight = 220.31 gm)Calcium 18.19 % CaMagnesium 11.03 % MgArsenic 34.01 % AsHydrogen 0.46 % H Oxygen 36.31 % O  Empirical Formula: CaMg(AsO4)(OH) Environment:In manganese deposits ar Langban. Locality:TL: Sweden, V„rmland, Filipstad, L†ngban mn Name Origin:From the Greek for indistinct, for its occurrence as massive.Physical Properties: Cleavage:[???] Indistinct Color:blue gray, green, gray, yellow, or light green. Density:3.73 - 3.79, Average = 3.76 Diaphaniety:Transparent Habits:Massive - Uniformly indistinguishable crystals forming large masses., , Hardness:5 - Apatite Luminescence:Non-fluorescent. Luster:Resinous Streak:whiteMore details...