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ardaite
Ardaite is a very rare sulfosalt mineral with chemical formula Pb19Sb13S35Cl7 in the monoclinic crystal system,〔(Mindat information page for Ardaite )〕 〔(Webmineral information page for Ardaite )〕 named after the Arda river, which passes through the type locality.〔(Handbook of Mineralogy information page for Ardaite )〕 It was discovered in 1978 and approved by the International Mineralogical Association in 1980.〔(Breskovska V. V., N. N. Mozgova, N. S. Bortnikov, A. I. Gorshkov, A. I. Tzepin (1982): ''Ardaite, a new lead-antimony chlorsulphosalt''. Mineral. Mag., 46, 357-361. )〕 〔(E.A.J. Burke, C. Kieft, M.A. Zakrzewski (1981), ''The Second Occurrence of Ardaite'', Canadian Mineralogist, vol. 19, pp. 419–422. )〕 〔(Pete Dunn and Michael Fleischer (1983), ''New Mineral Names'', American Mineralogist, vol. 68, pp. 642-45 )〕 It was the second well-defined natural chlorosulfosalt, after dadsonite.〔(Michael Zelenski, Tonci Balic Zunic, Luca Bindi, Anna Caravelli, Emil Makovicky, Daniela Pinto, Filippo Vurro (2006), ''First Occurrence of Iodine in Natural Sulfosalts: The Case of Mutnovscite'', American Mineralogist, vol. 91, pp. 21-28 )〕
Greenish gray or bluish green in colour, its lustre is metallic. Ardaite occurs as 50 µm fine-grained aggregates of acicular crystals associated with galena, pyrostilpnite, anglesite, nadorite, and Cl-bearing robinsonite and semseyite, in the Madjarovo polymetallic ore deposit in Bulgaria. Ardaite has a hardness of 2.5 to 3 on Mohs scale and a density of approximately 6.44.〔
The type locality is the Madjarovo polymetallic ore deposit in the Rhodope mountains.〔(See the Collection of Minerals at the National Natural History Museum, Sofia, Bulgaria )〕〔(See the Madjarovo deposit at Mindat.com )〕 Later its occurrence was proved in the Gruvåsen deposit, near Filipstad, Bergslagen, Sweden.〔
==References==
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