Anthonyite Dimensions: 13 mm x 12 mm x 6 mm Locality: Mexico Description: The label says only 'Mexico'; 'Villa Hermosa' is a possibility, as it is the only Mexican locality for this mineral mentioned in Mindat. Collection and photo Erik Vercammen — Photo: Erik Vercammen · CC BY 3.0
Anthonyite
A hydrous copper oxychloride discovered in 1963 in Michigan's Centennial mine.
Intro adapted from Wikipedia (CC BY-SA).
Anthonyite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Cu(OH)₂·3H₂O.
It is a member of the Anthonyite structural group.
Key properties: Mohs hardness 2; optically biaxial.
IMA symbol Aty, IMA status: approved, named in 1963.
Found in cavities and fractures in basalt, formed by the action of chlorine-bearing connate waters on copper (Centennial mine, Michigan, USA).
It is found associated with Tremolite, quartz, epidote, monazite, copper, cuprite, paratacamite (Centennial mine, Michigan, USA).
The name refers to Professor John Williams Anthony (1920–1992), American mineralogist, University of Arizona, Tucson, Arizona, USA.