General Information:
Chemical Formula:
(Y,Ca)Cu6(AsO4)3(OH)6·3(H2O)
Composition:
(Molecular Weight = 1,030.82 gm)
Calcium 0.97 % Ca
Yttrium 6.47 % Y
Copper 36.99 % Cu
Arsenic 21.80 % As
Hydrogen 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 white
More details...