A yellow or brown mineral that is a hydrated sulfate of ammonium and iron, found in oxidized ore deposits.
From ammonio- (containing ammonium) plus jarosite (a type of sulfate mineral named after a Spanish locality). The compound name reflects its chemical composition combining ammonium with jarosite mineral structure.
Ammoniojarosite is a mineral detective's clue—its presence in mine waste tells geologists that ammonium-rich waters once flowed through, making it useful for understanding how ore deposits weathered over time.
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