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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