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Ankerite: Ca(Fe++,Mg,Mn)(CO3)2 Sphalerite: (Zn,Fe)S Dickite: Al2Si2O5(OH)4
Comments: White, rhombohedral crystals of ankerite and dark gray, metallic sphalerite on beige dickite.
Location: Prego mine, Kladno, Czech Rebublic.
Scale: Picture size 2 cm.
© Dave Barthelmy