New Data on the Relation Between Caryinite and Arseniopleite

Pete J. Dunn and Donald R. Peacor
Department of Mineral Sciences, Smithsonian Institution, Washington, D.C. 20560, USA
Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA

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

Mineralogical Magazine; June 1987 v. 51; no. 360; p. 281-284; DOI: 10.1180/minmag.1987.051.360.10
© 1987, The Mineralogical Society
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