A brackebuschite group mineral from the Asaka gypsum mine, Koriyama City, Fukushima Prefecture, Japan

Abstract

A brackebuschite group mineral occurs as yellow powder with quartz, pyromorphite and mimetite from the dump of the Asaka gypsum mine, Fukushima prefecture, Japan. Electron microprobe analysis gave the empirical formula Pb1.92Fe0.96 [(V0.86P0.70As0.19S0.24)2.01O4] (OH)). It corresponds to a P analogue of calderonite. The powder X-ray diffraction pattern resembles that of calderonite. Lattice parameters obtained with the powder X-ray diffraction method are; a=7.734, b=5.952, c=8.851(Å), β= 111.85deg.