
PRECIOUS AND DECORATIVE NON-METALLIC MINERALS FROM EAST KAZAKHSTAN: GEOLOGICAL DEPOSITS AND PRESENT UTILISATION
(STEF92 Technology, 2017-06-20, Z. I. Chernenko, Jiri Chlachula)
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Gemstones inspired people since the very beginnings of humankind due to their esthetic nature and as a symbol of lasting value and social superiority. Precious and decorative stones from the East Kazakhstan Region are known in this area of Central Asia since the early prehistory. The most precious among the Kazakhstan gemstones пїЅ emeralds пїЅ were processed by the factories in the Urals in the 16th-19th Centuries. Among other well-known non-metallic minerals there are sapphires, topazes and tourmalines, mostly o...



