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jarosite |
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A trigonal mineral, KFe3 (SO4 )2 (OH)6 ;
alunite group; amber yellow to dark brown; forms druses of minute
crystals, crusts, and coatings; may be fibrous or fine-grained and
massive; associated with volcanic rocks; thought to form under solfataric
conditions at elevated temperatures and pressures; in some places with
alunite; at many localities in the Western United States, Bolivia, Europe,
and Russia. See also: cuprojarosite; kirovite.
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