Cyanotrichite is a rare secondary copper mineral that forms in an oxidation zone with other copper-bearing minerals. Translated from Greek as "blue hair", which corresponds to the color and shape of its crystals. Little described.
You can see cyanotrichite stone for sale and buy it in the Minerals of Russia online store.
General | |
---|---|
Category | Sulfate minerals |
Formula (repeating unit) |
Cu4Al2[(OH)12|SO4]·2H2O |
IMA symbol | Cya |
Strunz classification | 7.DE.10 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | C2/m |
Unit cell | a = 10.16 Å, b = 12.61 Å, c = 2.9 Å; Z = 1 |
Identification | |
Color | Sky-blue, azure-blue |
Crystal habit | Acicular crystals and fibrous aggregates; incrustations |
Fracture | Uneven |
Mohs scale hardness | 1-3 |
Luster | Silky |
Streak | Light blue |
Diaphaneity | Transparent to translucent |
Specific gravity | 2.76 |
Optical properties | Biaxial (+) |
Refractive index | nα = 1.588 nβ = 1.617 nγ = 1.655 |
Birefringence | δ = 0.067 |
Pleochroism | X = colorless; Y = pale blue; Z = bright blue |
2V angle | Measured: 82° |