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Formula: Bi2Se3
Selenide, stibnite group,
paramorph of
paraguanajuatite,
bismuth-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 6.25 to 6.98 measured, 7.54 calculated
Hardness: 2½ to 3
Streak: Shiny grey
Colour: Bluish grey
Common impurities: S
Environments
Guanajuatite occurs in hydrothermal deposits of low to medium temperatures. Associated minerals include
bismuthinite, bismuth,
clausthalite, nevskite,
galena, pyrite and
calcite
(HOM).
Localities
At the Buraco do Ouro mine, Cavalcante, Goiás, Brazil, kalungaite
occurs in a quartz-muscovite
mylonite, related to a peraluminous
granite, in platy anhedral aggregates along foliation planes.
Associated ore minerals include gold,
chalcopyrite,
bohdanowiczite,
clausthalite, guanajuatite,
stibiopalladinite,
sperrylite and padmaite.
Gangue minerals are muscovite,
quartz and rare tourmaline and
magnetite
(MM 70.1.123–130).
The type locality is the Santa Catarina mine, Rancho Calvillo, Santa Rosa, Sierra de Santa Rosa, Guanajuato Municipality,
Guanajuato, Mexico.
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