摘要：This study provides the preliminary report about first occurrence of orthorhombic 11C pyrrhotite (Fe(1-x)S) fromthe Sudetes, Poland. Samples of pyrrhotite-containing two-pyroxene gabbro were found in a classic pegmatitelocality in Michałkowa near Walim in the Góry Sowie Block. Based on microscopic methods, pyrrhotite isassociated with pentlandite, chalcopyrite, chromite, ilmenite, gersdorffite, magnetite, biotite, magnesiohornblende,clinochlore, lizardite and talc. X-Ray diffraction (XRD) indicate that pyrrhotite has orthorhombic11C structure and it is characterized by: a = 3.433(9) Å, b = 5.99(2) Å, c = 5.7432(5) Å, β = 90º and d102 =2.06906 Å. Mössbauer studies confirmed the XRD data. Pyrrhotite has three sextets with hyperfine parametervalues 30.8 T for sextet A, 27.9 T and 25.8 T for sextets B and C respectively, indicating orthorhombic structure,the composition near Fe10S11 and x = 0.0909.
关键词：orthorhombic pyrrhotite; Polish Sudetes; Góry Sowie Block
