Arsenian Nagyagite from Sacarimb, Romania: A Possible New Mineral Species

G. Simon, D. H. M. Alderton and T. Bleser*
Department of Mineralogy, University of Bucharest, l.N.Balcescu Av., 70111 Bucharest, Romania
Department of Geology, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, UK
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK
*Present address: Techn. Universität Clausthal, Inst. f. Mineralogie, Adolph-Roemer Str. 2A, D-38678 Clausthal-Zellerfeld, Germany.

Abstract: Arsenic-rich nagyagite (up to 5.5 wt % As) has been discovered in samples from the Au-Ag-Te deposit of Sacarimb, western Romania. Optical properties of the mineral show small but distinct differences to nagyagite (ss). Chemical analyses indicate a substitution of As for Sb, and chemical zonation suggests rapid changes in the chemistry of the mineralising fluids.

Keywords: nagyagite • arsenic • Sacarimb • Romania

Mineralogical Magazine; September 1994 v. 58; no. 392; p. 473-478; DOI: 10.1180/minmag.1994.058.392.12
© 1994, The Mineralogical Society
Mineralogical Society (www.minersoc.org)