guanajuatite

guanajuatite

[‚gwän·ə′hwä‚tīt]
(mineralogy)
Bi2Se3 Bluish-gray mineral composed of bismuth selenide, occurring in crystals or masses.
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The principal minerals found are argentite, aguilarite, naumanite, and guanajuatite, and it has been shown that contaminants such as arsenic, selenium, and antimony decrease with depth; thus minerals such as pyrargyrite and proustite also become rarer as mining goes deeper into the Earth.
Mexican silver mining

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