Tyrolite

 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.

Tyrolite
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)
Space group	P2/c (no. 13) or C2/c (no. 15)
Identification
References	[1]

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.

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.