gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1982.046.340.10 Ardaite—A New Lead-Antimony Chlorosulphosalt Breskovska V. V. Dept. of Mineralogy and Crystallography, ‘Kliment Ohridski’, University of Sofia, Bulgaria Mozgova N. N. Bortnikov N. S. Gorshkov A. I. Tsepin A. I. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Academy of Sciences of the USSR, Staromonetny per. 35, Moscow 109017, USSR 9 1982 46 340 357 361 23 3 1981 10 6 1981 Copyright © 1982, The Mineralogical Society 1982 Abstract

The first occurrence of new mineral ardaite (a chlorine sulphosalt) has been discovered in the Madjarovo polymetallic ore deposit (Bulgaria). The average composition is Pb 56.50, Ag 0.04, Sb 22.48, S 15.56, Cl 3.78, total 98.36 wt.%. The formula is Pb20–18 Sb12–24S34–36.5Cl6–8. The mineral occurs as fine acicular aggregates associated with galena, nadorite, a Cl-bearing robinsonite and Cl-beating semseyite, pyrostilpnite, silver- bearing tetrahedrite and anglesite.