Abstract
The genesis of the recently discovered and highly attractive jewelry stone charoite at its only known occurrence remains controversial. The authors present the hydrothermal-metasomatic nature of the charoite paragenesis, including charoite and associated minerals (tinaksite, canasite, miserite, and fedorite, etc.). Formation of charoite metasomatites is related to calc-alkaline metasomatism of mesocratic and melanocratic fenite, shonkinite, and alkaline minettes. The metasomatic column includes circum-ore metasomatites (dark, intermediate in color and composition, light orthoclase zone), charoite ore (lilac zone), and an axial quartz zone. The order of differential mobilities of components (from inert to most mobile) was: SiO2, (K2O + Na2O), (CaO + TiO2), AL2O3, Fe203, (FeO + MnO). Concentrated aqueous solutions of calcium and potassium chlorides were found in fluid inclusions in quartz associated with high-quality charoite.
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