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Callaghanite

#58522

Callaghanite

#58522
Availability
Sold
Size
3.5 x 3 x 2.5 cm - Miniature 
Formula
Cu2Mg2CO3(OH)6·2H2O (RRUFF)
Locality
Basic Refractories mine, Gabbs, Nye Co., Nevada, United States
Tagged
carbonate , copper

Callaghanite was first found at this locality, thus the type locality. It is a 6 or 7 locality mineral, but is only a copper-magnesium carbonate. The mineral was formed at the contact of diorite with serpentinized dolostone. The color is much like Azurite, an azure-blue. The crystals on this specimen are aggregated so there is not any single good crystals, which are usually quite nice.

Type Locality

Callaghanite

Formula
Cu2Mg2CO3(OH)6·2H2
Crystal System
Monoclinic 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous (Glassy) 
Color
azure, violet blue 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
3-3.5 

Data courtesy of Webmineral.

Special Info
Type Locality

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