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Formula: Bi2Se3
Selenide, stibnite group,
paramorph of
paraguanajuatite,
bismuth-bearing mineral
Specific gravity: 6.25 to 6.98
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
The type locality is the Santa Catarina mine, Rancho Calvillo, Santa Rosa, Sierra de Santa Rosa, Guanajuato Municipality,
Guanajuato, Mexico.
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