Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:CROOKESITE
Formula:Cu7(Tl,Ag)Se4
Crystal System:Quadratic (Tetragonal)
Strunz Nr:2/B.03-30
References:AM 35 (1950), 337; HB1 (1990)
Type Locality:Skrikerum, Kalmar, Sweden

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