Tyrolite

Tyrolite is a hydrous calcium copper arsenate carbonate mineral with the 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 1.5–2.0 and a specific gravity of 3.1–3.2. It is translucent with refractive indices of nα = 1.694, nβ = 1.726, and nγ = 1.730.

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Tyrolite
Arsenate and carbonate minerals
.mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-align:left}.mw-parser-output sub.template-chem2-sub{font-size:80%;vertical-align:-0.35em}.mw-parser-output sup.template-chem2-sup{font-size:80%;vertical-align:0.65em}CaCu5(AsO4)2CO3(OH)4·6H2O
Tyl
8.DM.10
Orthorhombic
Prismatic (2/m) (same H-M symbol)
P2/c (no. 13) or C2/c (no. 15)
Blue to green
Radial or botryoidal
1.5–2.0
Vitreous
Translucent
3.1–3.2
nα = 1.694nβ = 1.726nγ = 1.730

Tyrolite is a hydrous calcium copper arsenate carbonate mineral with the 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 1.5–2.0 and a specific gravity of 3.1–3.2. 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 specimen (4.0 cm × 2.6 cm × 2.6 cm (1.6 in × 1.0 in × 1.0 in)); from San Simon Mine in Santa Rosa-Huantajaya District, Iquique Province, Chile.(Click image for details of the mineral chemistry.)

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