Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:JOHNINNESITE
Formula:Na2Mn2+9(Mg,Mn2+)7(OH)8(AsO4)2(Si6O17)2
Crystal System:Anorthic (Triclinic)
Strunz Nr:8/F.16-40
Group:Howieite Group
References:MM 50 (1986), 667; AM 79 (1994), 991; HB2/1 (1995); HB4 (2000)
Type Locality:Kombat mine, Tsumeb, Otavi, Namibia

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