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Tangdanite (aka clinotyrolite)


Tangdanite (aka clinotyrolite)

6 x 4 x 4 cm - Sm Cabinet 
Ca2Cu9(AsO4)4(SO4)0.5(OH)9 9H2O (RRUFF)
Lovelock mine, Churchill Co., Nevada, United States
arsenate , copper

I have previously sold this occurence Tangdanite as Clinotyrolite, which has been discredited as being the same as Tangdanite. Mindat also states: "Unique combination of elements (the only Ca-Cu arsenate-sulphate mineral known)."

The crystals are stunning in-hand and even more so under the microscope. These are flat-lying to about 2mm across. Some of crystals are free-standing.


Data courtesy of Webmineral.

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