Tyrolite

Tyrolite
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

Tyrolite is a hydrated calcium copper arsenate carbonate mineral with formula: Ca Cu₅(As O₄)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 , 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.

References[]

^ Krivovichev, S. V. (1 August 2006). "Crystal chemistry and polytypism of tyrolite". American Mineralogist. 91 (8–9): 1378–1384. Bibcode:2006AmMin..91.1378K. doi:10.2138/am.2006.2040. S2CID 96895661.

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[1] Krivovichev, S. V. (1 August 2006). "Crystal chemistry and polytypism of tyrolite". American Mineralogist. 91 (8–9): 1378–1384. Bibcode:2006AmMin..91.1378K. doi:10.2138/am.2006.2040. S2CID 96895661.

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