Mrázekite

minerals

libethenite

pseudomalachite

beudantite

Formula: Bi2Cu3(PO4)2O2(OH)2.2H2O
Hydrated phosphate containing hydroxyl, bismuth-bearing mineral
Specific gravity: 4.90
Hardness: 2 to 3
Streak: Light blue
Colour: Cerulean blue
Environments

Metamorphic environments
Hydrothermal environments

Mrazekite forms in vesuvianite-grossular skarn invaded by secondary copper, bismuth and vanadium mineralisation (Webmin) It is a rare secondary mineral formed by oxidation of polymetallic sulphides. Associated minerals include chalcopyrite, tetrahedrite, chalcocite, malachite, pyromorphite, pseudomalachite, libethenite, reichenbachite, beudantite, bismutite, mixite and chrysocolla (HOM).

Localities

At Lautertal (Odenwald), Bergstraße, Darmstadt, Hesse, Germany, mrazekite occurs in silicified baryte veins, where it forms elongate, blue crystals up to 0.5mm across (AM 80.407-408)

At the type locality, the Podlipa deposit, Ľubietová, Banská Bystrica District, Banská Bystrica Region, Slovakia, Mrazekite forms as a secondary mineral derived by oxidation of mainly chalcopyrite and tetrahedrite (AM 77.1306) in the oxidation zone of an ore deposit containing chalcopyrite, tetrahedrite, pseudomalachite, apatite and an unknown primary bismuth mineral. The mrazekite occurs as slender needles isolated or loosely grouped as small rosettes in a quartz matrix (Mindat). Associated minerals include quartz, libethenite, pseudomalachite and euchroite (Dana).

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