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In the Oxford-Kimmeridgian deposits stages of the territory of western Tatarstan, it was discovered a field of stratiform pyrite mineralization. In this field clays are enriched by pyrite nodules. X-ray fluorescent and electron microscopic analyzes during the study of pyrite nodules revealed an increased content of rare-earth phosphates elements (monazites) in them. Monazites are mainly represented by LaPO4, CePO4, (La,Ce)PO4, (Nd,La)PO4 and SmPO4. They form single xenomorphic grains and short-prism crystals. Thre...

The Ashalchinsky bituminous field is located in the southeast of Tatarstan Republic, in south-east part (Volga-Ural region) of Russian platform. The Ufimian reservoir sandstones from above present productive layers blocked by caprocks of Kazanian claystones. Bituminous sandwich of greywacke, fine-grained, loose aggregate, cemented with bitumen. The study of sandstones by SEM analysis showed a high content of analcime - a mineral group of zeolites. Analcim forms crusts consisting of irregular crystal intergrowths. ...