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Anthonyite from Mexico
Category Halide mineral
(repeating unit)
Strunz classification 3.DA.40
Crystal system Monoclinic
Space group unknown
Crystal class Prismatic (2/m)
(same H-M symbol)
Color Lavender
Crystal habit Prismatic crystals, commonly curved along [001]; as incrustations
Cleavage {100}, good
Tenacity Sectile
Mohs scale hardness 2
Diaphaneity Translucent
Optical properties Biaxial (-)
Refractive index nα = 1.526 nβ = 1.602 nγ = 1.602
Birefringence δ = 0.076
Pleochroism X = rich lavender; Y = Z = deep smoky blue
2V angle Measured: 3°
References [1][2][3]

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.[1][2]