Aguilarite

selenide

acanthite

Formula: Ag4SeS
Sulphide selenide, acanthite group
Specific gravity: 7.40 to 7.53
Hardness: 4½
Streak: Grey-black
Colour: Bright lead-grey on fresh surfaces
Environments

Hydrothermal environments

Aguilarite is an uncommon, relatively low-temperature, mineral in hydrothermal deposits rich in silver and selenium, but deficient in sulphur (Webmin, HOM). Associated minerals include acanthite, naumannite, silver, stephanite, proustite, pearceite, calcite and quartz (HOM, Mindat).

The type locality is the San Carlos Mine, La Luz, Guanajuato Municipality, Guanajuato, Mexico.

Common impurities: Cu

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