gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1986.050.357.17 Mineralogy The Iron End-Member of the Pyrosmalite Series from the Pegmont Lead-Zinc Deposit, Queensland Vaughan J. P. Department of Mineral Exploration and Mining Geology, Western Australian School of Mines, Kalgoorlie, Western Australia 6430 9 1986 50 357 527 531 18 9 1984 26 6 1985 Copyright © 1986, The Mineralogical Society 1986 Abstract

Pyrosmalite [(Mn,Fe)8(OH,Cl)10Si6O15] has been identified by X-ray diffraction from the Pegmont lead-zinc deposit, north-west Queensland. Microprobe analyses indicate that it is the first reported occurrence of an extremely iron-rich member of the series. The characteristically high chlorine content of pyrosmalite in Pegmont and other similar base metal deposits may provide some evidence concerning the depositional environment of these stratiform Pb-Zn ores.

 Keywords pyrosmalite Pegmont Pb-Zn deposit Queensland Australia