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A considerable progress in industrial construction and civil engineering makes it necessary to increase the production and application of new heat-insulating materials based on accessible environmentally safe mineral products. The mineral composition and structural characteristics of KareliaпїЅs natural raw materials are favourable for the production of ceramic heat-insulating materials with required properties and characteristics such as porous structure, low density, low thermal conductivity and high strength. T...

Talc-bearing rocks in Kallievo-Murennanvaara deposit are associated with ultramafic rocks of peridotite-picritic series. Serpentinized rocks in the picritic portion of the sequence remained unaffected by talc alteration. Peidotitic komatiites, occurring below picrites which were altered to talc-carbonate rocks by carbon dioxide and then to talc-chloritic rocks under the influence of silica and alumina (the result of granite formation), were productive for soapstone. Kallievo-Murennanvaara soapstone deposit, is loc...