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Phyllotungstite

Type Locality
Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany
Mineral Data
(H2O,M)x(W,Fe)(O,OH)3·yH2O (M = Ca, Cs, Pb or K)
Strunz: 
7.GB.20
Physical Properties
Colour: 
Yellow
Hardness: 
2.0
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