V.I. Pavlyshyn, SYMMETRY-DISSYMMETRY OF CRYSTALS MICAS AND TOPAZ OF THE VOLYNIAN CHAMBER PEGMATITES: CRYSTALLOCHEMICAL, MORPHOLOGICAL AND GENETIC ASPECTS

https://doi.org/10.15407/mineraljournal.42.01.003

UDC 548.12 + 549.0 + 591/492

SYMMETRY-DISSYMMETRY OF CRYSTALS MICAS AND TOPAZ OF THE VOLYNIAN CHAMBER PEGMATITES: CRYSTALLOCHEMICAL, MORPHOLOGICAL AND GENETIC ASPECTS

V.I. Pavlyshyn, DrSc (Geology & Mineralogy), Prof., Academician of Higher School of the Acad. of Sci. of Ukraine. Researcher ID: D-6558-2019
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
E-mail: V.I. Pavlyshyn@ gmail.com

D.K. Voznyak, DrSc (Geology), Chief Researcher Fellow. https://orcid.org/0000-0002-6124-2033
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
E-mail: dkvoznyak@ukr.net

Language: Ukrainian

Mineralogical journal 2020, 42 (1): 03-11

Abstract: The Volyn chamber pegmatites in Korosten granites are continued to the zone in which the products of degassing of acid and basic fusions entered in chambers of free growth of crystals over a long period of time. Topaz is the most famous mineral in the Volynian pegmatites. The characteristic morphology of topaz from the Volynian pegmatites is of ten flattening of the crystals in a direction perpendicular to the prism face {110}. As a result, the extremal symmetry is not perfect (dissymmetrization). On the example of dissymmetrized topaz crystals, such a collision is clearly defined: the concept of a crystal, in the case of its dissymmetrization, loses the value of a mineral individual, acquires a heterogeneous structure, which corresponds to the loss of the main properties of the crystal — homogeneity and anisotropy. For such dissymmetrized crystals the term "anomalous monocrystal" is proposed — a visually homogeneous crystal whose individual growth pyramids belong to different spatial symmetry groups at the micro level. The theme "Fluid flows and morphology of mica and topaz" in the chamber pegmatites of Volyn' is presented comprehensively through the prism of symmetry-dissymmetry. The conclusion is that the columnar crystals of Li-Fe mica (sometimes without pinacoid {001}) are a consequence of the active interaction of two symmetries (the Curie principle) — the fluid flow and the crystal. Dissymmetrization of topaz crystals was carried out under the conditions of one-sided flow of deep fluid flows with symmetry of the "arrow".
Keywords: symmetry-dissymmetry of crystals, deep fluid flow, topaz, Li-Fe mica, chamber pegmatites of Volyn.

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