What is "tyrolite"

Tyrolite \Tyr"o*lite\, n. [From Tyrol, where it occurs.] (Min.) A translucent mineral of a green color and pearly or vitreous luster. It is a hydrous arseniate of copper.

n. (context mineralogy English) A hydrated calcium copper arsenate carbonate mineral that forms glassy blue to green orthorhombic radial crystals and botryoidal masses.

Tyrolite is a hydrated calcium copper arsenate carbonate mineral with formula: Ca Cu( As O) CO(O H)·6 HO. 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.