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Jarosite

Type Locality
Jaroso Ravine, Sierra Almagrera, Cuevas del Almanzora (Cuevas de Vera), Almería, Andalusia, Spain
Mineral Data
KFe3+ 3(SO4)2(OH)6
Strunz: 
7.BC.10
Physical Properties
Crystal System: 
Trigonal - Pyramidal Class
Hardness: 
2.5 - 3.5
Tenacity: 
brittle