Occurs in Pinal County. Common in Arizona.
Chemical Formula: KFe3+3(SO4)2(OH)6
Specific Gravity: 2.9-3.3
Hardness: 2.5-3.5
Jarosite is a potassium iron sulfate hydroxide mineral that often appears as yellow to brownish-yellow crystals or crusts. It is a product of weathering in sulfide ore deposits.