Images
Formula: CuSe2
Selenide, paramorph of
krut'aite, marcasite group
Crystal System: Orthorhombic
Specific gravity: 6.673 calculated
Hardness: 2 to 2½
Streak: Black
Colour: Black
Luminescence: Not fluorescent under UV
Environments
Sedimentary environments
Hydrothermal environments
Petříčekite is a relatively new mineral, approved in 2016.
Localities
At the Sierra de Cacheuta, Cacheuta District, Luján de Cuyo department, Mendoza Province, Argentina,
petříčekite occurs in calcitic veinlets in
porphyry. Associated minerals include
clausthalite, krut'aite,
molybdomenite and
native selenium
(HOM).
Petříčekite from Sierra de Cacheuta -
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At El Dragón mine, Porco Municipality, Antonio Quijarro Province, Potosí, Bolivia, petříčekite occurs as a
late-stage mineral in hydrothermal veinlets cutting black shale and
siltstone. Associated minerals include
krut'aite, klockmannite,
watkinsonite and
native selenium
(HOM).
Petříčekite from El Dragón mine -
Image
At the type locality, the Předbořice deposit, Předbořice, Kovářov, Písek District, South Bohemian Region, Czech
Republic, petříčekite occurs in low-temperature hydrothermal veins cutting metamorphic rocks near the contact
with a granitoid pluton. Associated minerals include
eucairite,
athabascaite/klockmannite,
tiemannite, eskebornite and
unknown selenides
(HOM).
Petříčekite from the Předbořice deposit -
Image
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