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Formula: Cu(Co,Ni)2Se4
Selenide, seleniospinel group, spinel
supergroup, cobalt- and nickel- bearing
mineral
Crystal System: Isometric
Specific gravity: 6.6 measured, 6.59 calculated
Hardness: 3½
Streak: Black
Colour: Bronze
Luminescence: Not fluorescent under UV
Environments
Localities
There are two co-type localities, Eagle Claims U-Cu-Se occurrence, and Ato Bay, Beaverlodge Lake, Goldfields District,
both at Beaverlodge Lake area, Saskatchewan, Canada.
At the Eagle Claims U-Cu-Se occurrence, Beaverlodge Lake area, Saskatchewan, Canada, tyrellite occurs with other
selenides, as one of the the youngest hydrothermal replacements and open space
fillings in sheared Precambrian rocks, which also contain uraninite deposits
(HOM).
At Ato Bay, Beaverlodge Lake, Goldfields District, Beaverlodge Lake area, Saskatchewan, Canada, tyrellite occurs
with other selenides, as one of the youngest hydrothermal replacements and open
space fillings in sheared Precambrian rocks, which also contain uraninite
deposits. Associated minerals include umangite,
klockmannite, clausthalite,
pyrite, hematite,
chalcopyrite and chalcomenite
(HOM).
At Petrovice, Nové Město na Moravě, Žďár nad Sázavou District, Vysočina Region, Czech Republic, tyrellite occurs
with berzelianite, eucairite,
crookesite, ferroselite,
bukovite, krut'aite,
athabascaite, calcite and
dolomite
(HOM).
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