General Information:
Chemical Formula:
Co3(AsO4)2·8(H2O)
Composition:
(Molecular Weight = 598.76 gm)
Cobalt 29.53 % Co
Arsenic 25.03 % As
Hydrogen 2.69 % H
Oxygen 42.75 % O
Empirical Formula:
Co3(AsO4)2·8(H2O)
Name Origin:
Named from the Greek, erythros for "red."
Physical Properties:
Cleavage:
[010] Perfect
Color:
colorless, violet red, light pink, or purple red.
Density:
3.06 - 3.18, Average = 3.12
Diaphaniety:
Transparent to subtranslucent
Habits:
Striated - Parallel lines on crystal surface or cleavage face., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Divergent - Crystals radiate from a center without producing stellar forms.
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
None.
Luster:
Pearly
Streak:
pinkish red
More details...