Инд. авторы:	Vasiliev V.I., Borisenko A.S., Mortseva N.K.
Заглавие:	Jonassonite, aubi5s4, from gold ore deposit dakripen (vietnam)
Библ. ссылка:	Vasiliev V.I., Borisenko A.S., Mortseva N.K. Jonassonite, aubi5s4, from gold ore deposit dakripen (vietnam) // Записки Российского минералогического общества. - 2010. - Vol.139. - Iss. 3. - P.48-54. - ISSN 0869-6055.
Внешние системы:	РИНЦ: 17059065;
Реферат:	rus: Впервые для рудных месторождений Вьетнама в минеральных ассоциациях месторождения Дакрипен найдена фаза, главными элементами которой являются Au, Bi, S. Типичная минеральная ассоциация, в которой находится минерал, оптические свойства и химический состав позволяют считать его джонассонитом, но с очень низким содержанием свинца. eng: For the first time for ore deposits of Vietnam, the mineral phase containing Au, Bi, and S as the major elements has been found in gold-bearing ores of Dakripen deposit. As a minor isomorphic admixture, lead is present there also. The mineral is the rare one, it was detected only in polished sections, occurring as irregular or ellipsoid grains up to 35 ìm in size, together with pyrite, galena, sphalerite, bismuthinite, ikunolite, native Bi, and, in some cases, with gold. All these species are constituents of the third stage of ore-forming process. In reflected light the mineral is bluish-white in color; the reflectance comparable with ikunolite, and slightly over than that of bismuthinite; there is a very weak pleochroism and visible anisotropy, with analyzer. The mineral is opaque and brittle, without internal reflections. According to 18 microprobe analyses, its mean chemical composition and quantitative variations of major elements are: Au 14.02 (13.11-14.58), Bi 76.37 (74.93-76.91), Pb 0.49 (0.10-1.00), S 9.80 (8.87-10.07), total 100.68 wt %. Empirical formula, calculated for the mean values of elements. is: Au0.96(Bi4.91Pb0.03)4.94S4.10; it is similar to the idealized formula of jonassonite from the Nagyborzsony deposit (Hungary) approved by Commission on New Minerals and Mineral Names, IMA: Au(Bi,Pb)5S4. The typical association of the mineral, its optical properties and chemical composition allow to consider that the mineral of the Dakripen deposit is the Pb-bearing variety of jonassonite, but with very low lead content. It may be assumed that the real formula of jonassonite, without sporadic impurities of Pb and other elements. must be AuBi5S4, as it was stated before in the first communication of the Commission on New Minerals and Mineral Names, IMA, and as it is typical for these minerals in Kazakhstan, Russia, Japan, Germany, Czech Republic, the USA, and Australia.
Ключевые слова:	Dakripen gold ore deposit; the first finding in Vietnam; Bi and S; jonassonite; compound of Au; третья стадия рудообразования; месторождение Дакрипен; первая находка во Вьетнаме; Bi и S; джонассонит; минеральная фаза Au; third stage of the ore-forming process;
Издано:	2010
Физ. характеристика:	с.48-54
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