|Crystal symmetry||Monoclinic 2/m prismatic|
|Crystal habit||Prismatic crystals, commonly curved along ; as incrustations|
|Mohs scale hardness||2|
|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°|
It was discovered in 1963 in the Centennial mine, Calumet, Houghton County, Michigan, USA. It was discovered by the University of Arizona mineralogist John W. Anthony (1920–1992), who named it for himself.
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.
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