Initial findings report chemical composition and diagnostic features of placer nephrite in Buryatia, suggesting a link to primary sources.
The material composition of placer (alluvial) dolomite-related nephrite from the Tsipa River in the nephrite-bearing region of the Vitim Highlands has been examined. Initial data on the mineral composition of both the inner and outer zones of alluvial dolomite-related nephrite pebbles have been obtained. Placer nephrite is characterized by a developed staining rim, a small amount of accessory minerals, fine-grained texture, randomly fibrous structure, and elevated alkali content. Chemical composition features of the staining rim formed under exogenous conditions include the development of manganese and iron hydroxides, with a significant increase in Fe3+ content and elevated levels of Co and Ba. A genetic relationship has been established between the placer nephrite and its primary source, the nephrite from the Kavoktinskoe deposit. A comparison between primary and placer dolomite-type nephrite has led to the identification of diagnostic characteristics for conducting expert assessments.
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V. F. Sotnikova (2025) studied this question.
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