Botallackite
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| Botallackite | |
|---|---|
| Category | Category:Copper minerals, Category:Halide minerals |
| Chemical formula | Cu2[(OH)3|Cl] |
| Identification | |
| Color | Shades of green |
| Crystal system | Monoclinic |
| Cleavage | One, distinct to good |
| Refractive index | nα= 1.775, nβ= 1.800, nγ= 1.846 |
| Birefringence | δ = 0.071 |
| Dispersion | r > v, strong |
| Pleochroism | Weak |
| Density | 3.6 |
| Diaphaneity | Transparent to translucent |
Botallackite, chemical formula Cu2[(OH)3|Cl] is a secondary copper mineral, named for its type locality at the Botallack mine, St Just in Penwith, Cornwall. It is polymorphous with Atacamite, Paratacamite and Clinoatacamite.[1]
In the monoclinic crystal system, Botallackite is mountain-green to green in colour, with one distinct to good cleavage.[1]
Botallackite forms in copper deposits exposed to weathering and salt water.[1]
[edit] References
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