Aguilarite
A variety of Minerals

What is Aguilarite?
Aguilarite is bright lead-gray on fresh surfaces but becomes dull iron black when exposed to air. The mineral occurs with massive habit, as elongated pseudododecahedral crystals up to 3 cm (1.2 in), or as intergrowths with acanthite or naumannite.
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Aguilarite Localities Map
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Key Characteristics
Formation of Aguilarite
Aguilarite is uncommon, and forms at relatively low temperatures in hydrothermal deposits rich in silver and selenium but deficient in sulfur. The mineral is known from a number of countries in North and South America, Europe, Asia, and Australasia. Aguilarite occurs in association with acanthite, calcite, naumannite, pearceite, proustite, silver, stephanite, and quartz.
Quick Facts
Physical Properties
- Color
- Bright lead-gray on fresh surfaces
- Hardness (Mohs)
- 2.5
- Density
- 7.65 g/cm³
- Streak
- grey-black
Chemical Properties
- Chemical Formula
- Ag4SeS
- Elements
- Ag, S, Se

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