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Formula: CdSe
Selenide, wurtzite group,
cadmium-bearing mineral
Crystal System: Hexagonal
Specific gravity: 5.47 measured, 5.807 calculated
Hardness: 4
Streak: Black
Colour: Black
Environments
Sedimentary environments
Hydrothermal environments
Localities
At the Tumiñico mine, Sierra de Cacho, Villa Castelli, General Lamadrid department, La Rioja Province, Argentina,
brodtkorbite occurs in a telethermal (deposits formed away from the
source of igneous intrusions at low temperature and shallow depth)
selenide vein-type assemblage. The assemblage also contains
berzelianite, bellidoite,
cadmoselite, chaméanite,
crookesite, eskebornite,
eucairite, ferroselite,
hakite, klockmannite,
trogtalite-kruťaite,
tiemannite, tyrrellite,
umangite and uraninite
(CM 40.1.225–237).
At the type locality, Ust' Uyuk deposit, Turan District, Tuva, Russia, cadmoselite occurs in sedimentary
strata, under reducing secondary conditions of medium
to high alkalinity. Associated minerals include ferroselite,
clausthalite, cadmium-bearing
sphalerite, selenium,
greenockite, pyrite,
laumontite and calcite
(HOM).
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