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 8.DM.10
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)

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 in Schwaz, Tyrol, Austria.

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.

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