Orthorhombic sulfur from Cap Garonne, Mine du Pradet

Abstract

Natural orthorhombic sulfur (α-S8), grown on galena crystals from Cap Garonne, Mine du Pradet, France, were studied by single crystal X-ray diffraction at 150 K: Fddd, a=1036.75(5), b=1273.54(7), c=2437.85(13) pm, wR=0.0380, 1433 F2 values (all data) and 37 variables. Refinements of the occupancy parameters along with EDX data indicate pure sulfur.

The crystal structure of Ni-rich gordaite–thérèsemagnanite from Cap Garonne, France

“…The upper part of the wall and the roof are made of a less compact conglomerate with malachite and cerussite, and the Zn−Co–Ni sulfates ktenasite, guarinoite and thérèsemagnanite. A thick, solid, fine-grained galena vein is located between the lower and upper part, with rare cavities hosting covellite, native sulphur (Kösters et al , 2019) and anglesite. The specimen studied was found in a fracture of this galena vein.…”