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Tyrolite is a hydrate calcium copper arsenate mineral carbonate mineral with the chemical formula calciumcopper5(arsenicoxygen4)2carbon3(Ohydrogen)4⋅6water. Tyrolite forms glassy, blue to green orthorhombic radial crystals and botryoidal masses. It has a Mohs hardness of 1.5–2.0 and a relative density of 3.1–3.2. It is translucent with refractive index 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.
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