Tyrolite

Tyrolite is a hydrous calcium copper arsenate carbonate mineral with the formula CaCu₅₂CO₃₄⋅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.
File:Chrysocolla-Tyrolite-Clinotyrolite-202108.jpg|thumb|left|Chrysocolla on tyrolite and clinotyrolite specimen ; from San Simon Mine in Santa Rosa-Huantajaya District, Iquique Province, Chile.