Tyrolite

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Tyrolite
Tyrolit, Słowacja.jpg
A sample of tyrolite from Slovakia
General
Category Arsenate minerals
Formula
(repeating unit)
CaCu5(AsO4)2CO3(OH)4·6H2O
Strunz classification 08.DM.10
Chrysocolla on Tyrolite and Clinotyrolite, San Simon Mine, Santa Rosa-Huantajaya District, Iquique Province, Chile. 4.0 x 2.6 x 2.6 cm. Click image for details of the mineral chemistry.

Tyrolite is a hydrated calcium copper arsenate carbonate mineral with formula: CaCu5(AsO4)2CO3(OH)4·6H2O. Tyrolite forms glassy blue to green orthorhombic radial crystals and botryoidal masses. It has a Mohs hardness of 1.5 to 2 and a specific gravity of 3.1 to 3.2. It is translucent with refractive indices of nα=1.694 nβ=1.726 and nγ=1.730.

It is a secondary mineral formed by the weathering of associated copper and arsenic minerals. It was first described in 1845 for an occurrence near Innsbruck, Tyrol, Austria.

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