Pilsenite from Poruba pod Vihorlatom, Vihorlat Mts. (Slovak Republic)
Keywords
Abstract
Pilsenite, ideally Bi4Te3 was found in the body of hydrothermal metasomatites, which is located near Poruba pod Vihoraltom, Vihoralt Mts., Slovak Republic. It forms lead-grey, subhedral grains up to 7 mm in size with typical perfect cleavage. Pilsenite grains are often grouped into the aggregates and clusters up to 3 × 2 cm, which are embedded in brownish metasomatite. Its refined unit-cell parameters from the powder X-ray diffraction data (for the trigonal space group R-3m) are a = 4.430(4), c = 41.834(3) Å with V = 710.971(1) Å3. The chemical composition of pilsenite is close to the end member and apart from Bi and Te only minor contents of Pb (up to 0.06 apfu), Se (up to 0.03 apfu) and S (up to 0.03 apfu) were detected. Its average empirical formula is (Bi3.95Pb0.05)Σ4.00(Te2.96Se0.02S0.02)Σ3.00 on the basis of 7 apfu.
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References
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