gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1987.051.360.10 New Data on the Relation Between Caryinite and Arseniopleite Dunn Pete J. Department of Mineral Sciences, Smithsonian Institution, Washington, D.C. 20560, USA Peacor Donald R. Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA 6 1987 51 360 281 284 13 3 1986 16 6 1986 Copyright © 1987, The Mineralogical Society 1987 Abstract

Caryinite from Låmgban, Sweden, and arseniopleite from both the Långban and Sjö Mines in Sweden, are re-examined chemically and crystallographically. Both species are monoclinic, with space group C2/c, and similar lattice parameters. The general formula for caryinite is Na4Ca4Ca4(Mn,Mg)8(AsO4)12, and that for arseniopleite is Na4Ca4Mn4(Mn,Mg)8(AsO4)12. The species status of arseniopleite remains uncertain; it may have Mn dominant in the M(1) site.

 Keywords caryinite arseniopleite arsenates Längban Sjö mines Sweden