Agardite-(Y)

General Information: Chemical Formula:(Y,Ca)Cu6(AsO4)3(OH)6·3(H2O) Composition:(Molecular Weight = 1,030.82 gm)Calcium 0.97 % CaYttrium 6.47 % Y Copper 36.99 % CuArsenic 21.80 % AsHydrogen 1.17 % H Oxygen 32.59 % O  Empirical Formula: Y0.75Ca0.25Cu6(AsO4)3(OH)6·3(H2O) IMA Status:Approved IMA 1969 Locality:TL: Morocco, Bou Skour mine, Jebel Sarhro Name Origin:Named for the composition and for Jules Agard, Geologist, Bureau de Recherches Geologiques et Minieres, Orleans, France.Physical Properties: Color:blue green or blue. Density:3.66 - 3.72, Average = 3.69 Diaphaniety:Translucent Habits:Acicular - Occurs as needle-like crystals., Rosette - Bundled tabular aggregates resembling rose flower petals., Spherical - Spherical, rounded aggregates. Hardness:3-4 - Calcite-Fluorite Luster:Vitreous (Glassy) Streak:greenish whiteMore details...