Claringbullite , Connellite Locality: Carpenara (slag locality), Varenna Valley, Genova, Genova Province, Liguria, Italy Greenish blue tiny crystals and crusts of Claringbullite (analysed) together with some nice "hairy" spheres of possible Connellite. Field of view 3 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Claringbullite
Claringbullite is an IMA-recognized mineral species in the halide class, with the chemical formula Cu²⁺₄FCl(OH)₆.
It crystallizes in the hexagonal crystal system (space group P6_3/mmc). It is a member of the Claringbullite structural group.
Key properties: specific gravity 3.9; Pearly luster; optically uniaxial.
IMA symbol Cgb, IMA status: approved, named in 1976.
Found in oxidized copper ore or slag, produced under chlorine-rich conditions.
It is found associated with Cuprite, malachite, quartz, brochantite, nantokite, paratacamite, connellite, spangolite.
The mineral was named to honor Gordon Frank Claringbull (1911–1990), formerly Keeper of Mineralogy and Director of the British Museum (Natural History), London, England.