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aguilarite
Aguilarite is an uncommon sulfosalt mineral with formula Ag4SeS. It was described in 1891 and named for discoverer Ponciano Aguilar. ==Description== 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 , or as intergrowths with acanthite or naumannite.〔
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