Systematic studies of Ca-bearing minerals from rare-element pegmatites are scarce. The published studies deal mostly with particular minerals or mineral groups, such as plagioclase, apatite, calcic tourmalines, titanite, and others, from a single pegmatitic body. Recently, a phenomenon of a postmagmatic Ca-metasomatism, observed in many pegmatites worldwide, was addressed in detail by Martin & De Vito (2014). The authors proposed a model of a convecting hydrothermal system, in which a pegmatite-derived orthomagmatic fluid is responsible not only for the redistribution of certain elements within the pegmatite, but also for the introduction of Ca and some other elements from the...

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