Arsenic apatite from the calcareous skarns of the Kanakay Fe-deposit (Southern Urals)

Abstract

In the near-ore marble of the Kanakai skarn-magnetite deposit, arsenic apatite was found, which forms small euhedral and subhedral crystals confined to cracks. The As2O3 content in it reaches 0.9 wt %. % (As 0.04 apfu), and stable impurities of SiO2 (0.35–1.33 wt %), SO3 (0.28–0.63 wt %), and Cl (0.09–0.30 wt %) are typical. It could have crystallized into the post-ore stage when the rocks underwent to hydrothermal fluids relatively rich in As, S, and Cl.