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Mineralpedia Details for Callaghanite

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Callaghanite

Callaghanite

Dr. Eugene Callaghan is the namesake of the mineral Callaghanite as the former Director of the New Mexico Bureau of Mines in the United States and for his work on magnesite deposits. Callaghanite is a rare mineral that is found at the type locality at the Premier Chemical mine near Gabbs, Nevada, but also has an additional USA locality in Oklahoma, as well as newer localities in Italy, Germany, and Austria. It occurs disseminated at the type locality in the contact zone of a diorite and a serpentinized dolostone.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/callaghanite.pdf

Formula
Cu2Mg2CO3(OH)6ยท2H2
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 
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Callaghanite from Basic Refractories mine, Gabbs, Nye Co., Nevada, United States

Callaghanite
            from Basic Refractories mine, Gabbs, Nye Co., Nevada, United States

Excellent blue pyramidal and bypyramidal Callaghanite crystals to 1.5mm with clear bladed Magnesite to 3mm. Ex. Kent England Collection specimen.

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