Colloform sphalerite in Pcheloyad Pb-Zn deposit, Eastern Rodopes, Bulgaria.

A late-deposited colloform banded sphalerite from Pcheloyad and Sporno deposits in samples from the Earth and Man National Museum was studied. Its composition is very close to the theoretical one for sphalerite. Iron, gallium, cadmium and indium are established as trace elements in concentrations lower than those in earlier deposited sphalerite generations. The presence of wurtzite was proved by X-ray powder diffraction. A similar low-temperature colloform banded sphalerite of the Schalenblende type has so far not been described in the lead-zinc Zvezdel-Pcheloyad ore field. [ABSTRACT FROM AUTHOR]