Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:NATROALUNITE
Formula:Na2Al6(SO4)4(OH)12
Crystal System:Rhomboedral (Trigonal)
Strunz Nr:6/B.11-10
Group:Alunite-Jarosite Group Alunite Subgroup
References:AM 77 (1992), 1092; HB5 (2003)
Type Locality:National Bell mine, Silverton, Hinsdale Co., Colorado, USA

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