Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:HELMUTWINKLERITE
Formula:Pb(Zn,Cu)2(AsO4)2(OH,H2O)2
Crystal System:Anorthic (Triclinic)
Strunz Nr:7/C.31-100
Group:Tsumcorite Group
References:NJMM (1980), 118; EJM 10 (1998), 179; HB4 (2000)
Type Locality:Tsumeb, Namibia

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