Abstract
The desilicated pegmatites from the area of the Urdini lakes, Northwest Rila Mountain intersect ultramafic bodies, occurring among high-grade metamorphic basement of the Rila-Rhodope batholith. The following rock-forming minerals are characteristic – plagioclase (mainly oligoclase), phlogopite, amphibole, actinolite, tremolite, anthophyllite, chlorite and others. Minerals from the amphibole supergroup are studied using optical, X-ray diffraction, X-ray spectral and chemical methods. Their morphology and crystal chemistry are characterized as well as their classification and nomenclature position are determined. Actinolite, tremolite, anthophyllite and Mg-hornblende from the amphibole supergroup are identified. The trends and variations in the chemical composition at their central and peripheral sections have been clarified.
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