Guanajuatite

guanajuatite

bismuth

bismuthinite

clausthalite

Images

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

Hydrothermal 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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