Abstract
The article deals with a new vein deposit of kyanite in Bulgaria and some considerations concerning the origin of kyanite veins in general. The kyanite is found in quartz veins within garnetiferous staurolite schists of probable Jurassic age. The kyanite crystals are up to ten centimeters long along the c-axis and form parallel rodlike aggregates perpendicular to the selvages of the veins. The origin of the kyanite in the quartz veins is due to mobilization of silicon and aluminum under the action of boron and small quantities of alkalies, contained in pneumatolitic-hydrothermal or hydrothermal solutions. The temperature and the pressure are thought rather low but should be taken into consideration. It is suggested that the terms “stress” and “antistress minerals” be dropped and the terms “piezogene” and “thermogene” be introduced, depending on whether pressure or temperature plays the prevalent role in the formation of the mineral. — auth. English Summ.
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