gems, chrysoprase, Russia, central Urals

The articles in this collection examine the prospects for the development of exploration for non-metallic mineral resources in the ultrabasic rocks of the geosynclines and platforms of the USSR; a general genetic and industrial classification is given for deposits of olivinities, chrysotile and amphibole asbestos, talcites, phlogopite and vermiculite, listvenites, jadeitite, nephrite, chrysolite and chrysoprase, and apatite in carbonatites based on specific deposits. Non-metallic mineral resources of hyperbasites: Directions and prospects for the development of geological prospecting and exploration work on deposits of non-metallic minerals associated with hyperbasites. Ultrabasic rock formations of the Urals and associated non-metallic mineral deposits. Asbestos and talcites in the hyperbasites of the Orenburg Urals. Patterns of distribution of non-metallic minerals in ultrabasic rocks of the Altai-Sayan folded region. Genesis and quality assessment of non-metallic minerals in the Kovdor complex of ultrabasic-alkaline rocks and carbonatites. Genetic types of asbestos deposits associated with ultrabasic rocks and patterns of their distribution in folded regions. On the mineralogy of serpentinites and the asbestos-bearing potential of ultrabasic rocks. Serpentinization of hyperbasites in the Voykar-Syninsky massif. Metamorphic features of hyperbasites in relation to the formation of chrysotile asbestos deposits. Geological features of Ural chrysotile asbestos deposits. Hyperbasites of Tuva and Western Sayan and their associated non-metallic mineral resources. Asbestos deposits in the western part of the Altai-Sayan region. Asbestos occurrences in the hyperbasites of the Mongolian People’s Republic. Controlling factors of chrysotile-asbestos mineralization and prognostic evaluation of asbestos deposits. Study of the structure, physicochemical and mechanical properties of chrysotile asbestos as raw material for the asbestos-cement industry. Study of the quality of asbestos from the Dzhetygarin deposit depending on ore types and their petrographic structure. Industrial-genetic types of amphibole asbestos deposits in the hyperbasite formation. Questions of genesis, metamorphism, and asbestos potential of ultrabasic rocks of Western Priazovye. Jadeitites and olivinities in the hyperbasites of the Polar Urals. On the thermal curve of amosite. Listvenites in the hyperbasites of the northern Kuznetsk Alatau and their potential uses. Evaluation of magnesian mica deposits as raw material for new types of mica-based insulation. On the composition and properties of industrial phlogopites of the USSR from various deposit types. On the composition of phlogopite from different types of deposits. On the issue of iron content in micas. On ordered, mixed-layer hydrophlogopite (hydrobiotite) with a repetition period of 22.2 Å. Geological and mineralogical criteria for evaluating the quality of raw materials from vermiculite deposits associated with ultrabasic rocks. The Mugodzhar vermiculite deposit. Geochemistry of the weathering crust at the Kovdor vermiculite deposit. Influence of the chemical environment and composition of magnesian-iron micas on their alteration patterns in ancient weathering crusts. Nephrite in the hyperbasites of the Khalilovo massif in the Southern Urals. Geology and formation conditions of the Param nephrite deposit in Eastern Siberia. Nephrite deposits in Eastern Sayan. Gem-quality chrysolite from the hyperbasites of Eastern Sayan. Ornamental chrysoprase of the Middle Urals. Experimental study of mineral formation in relation to the genesis of non-metallic mineral resources in the hyperbasite formation.