Tirolit
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Mineral NameTirolit
Chemical FormulaCa₂Cu₉(AsO₄)₄(CO₃)(OH)₈·11H₂O
Mohs Hardness1.5
Crystal Systemorthorhombic
Lustervitreous
Streak Colorpale blue to greenish-white
Cleavageperfect on {001}
Fractureuneven
Specific Gravity3.1
Colorslight blue, sky blue, greenish-blue, emerald green
Transparencytranslucent
Type LocalityTyrol, Austria (type locality); Brixlegg, Austria
Mineral GroupArsenates
Usescollector
Associated Mineralsazurite, malachite, olivenite, chalcophyllite
Rarityuncommon
Description
The specimen displays light blue to greenish-blue aggregates, possibly botryoidal or radiating, on a dark matrix.
Geological Context
Tirolit is a secondary mineral found in the oxidized zones of copper arsenide deposits, forming from the alteration of other copper and arsenic-bearing minerals.
