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Category  Halide mineral
Strunz classification  3.DA.40
Formula (repeating unit)  Cu(OH,Cl)2•3(H2O)
Color  Lavender
Crystal system  Monoclinic Space group unknown
Crystal class  Prismatic (2/m) (same H-M symbol)

Anthonyite is a hydrous secondary copper halide mineral with chemical formula of Cu(OH,Cl)2•3(H2O).

It was discovered in 1963 in the Centennial mine, Calumet, Houghton County, Michigan, United States. It was discovered by the University of Arizona mineralogist John W. Anthony (1920–1992), who named it for himself.

Anthonyite is lavender in color, has a Mohs hardness of 2 and crystallizes in the monoclinic crystal system.

Anthonyite occurs as an alteration of native copper in basalt in fractures and cavities by circulation of chloride rich groundwater or connate fluids. The similar orthorhombic mineral calumetite occurs by the same process. It occurs associated with tremolite, quartz, epidote, monazite, native copper, cuprite and paratacamite in the Centennial mine area. It also occrs in the Cole mine, at Bisbee, Cochise County, Arizona; and Villa Hermosa, Sonora, Mexico. It occurs as a slag mineral in Richelsdorf, Hesse, Germany and Laurium, Greece.


Anthonyite Wikipedia

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