Botallackite

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Botallackite
CategoryCategory:Copper minerals, Category:Halide minerals
Chemical formulaCu2[(OH)3|Cl]
Identification
ColorShades of green
Crystal systemMonoclinic
CleavageOne, distinct to good
Refractive indexnα= 1.775, nβ= 1.800, nγ= 1.846
Birefringenceδ = 0.071
Dispersionr > v, strong
PleochroismWeak
Density3.6
DiaphaneityTransparent 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]

References

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