O.P. Vovk, PSEUDOSYMMETRY OF QUARTZ CRYSTALS AND ITS MINERALOGICAL AND GENETICAL SIGNIFICANCE
https://doi.org/10.15407/mineraljournal.47.01.033
UDC 548.4:549.5:553.2 (477+99)
PSEUDOSYMMETRY OF QUARTZ CRYSTALS AND
ITS MINERALOGICAL AND GENETICAL SIGNIFICANCE
O.P. Vovk 1, PhD (Geology), Associate Professor
E-mail: geologygeochemistry@gmail.com; orcid: 0000-0002-1509-0905
І.М. Naumko 2, DrSc (Geology), Corresponding Member of the NAS of Ukraine,
Prof., Head of Department
E-mail: naumko@ukr.net; orcid: 0000-0003-3735-047X
H.O. Zankovych 2, PhD (Geology), Junior Researcher
E-mail: zankovuch@ukr.net; orcid: 0009-0003-6634-8042
1 Lesya Ukrainka Volyn National University
13, Voli Ave., Lutsk, Ukraine, 43025
2 Institute of Geology and Geochemistry of Combustible Minerals of the NAS of Ukraine
3-a, Naukova Str., Lviv, Ukraine, 79060
Language: Ukrainian
Mineralogical journal 2025, 47 (1): 33-44
Abstract: The pseudosymmetry of quartz crystals is described based on the example of "Marmarosh diamonds" a newly identified genetic type of quartz — skeletal crystals with hydrocarbon inclusions. All theoretically possible morphological types of pseudosymmetry in quartz crystals are discussed: L33L2, L33L23PC, L66L27PC, L3, L2PC, C, L33P, L22P, L2, L66P, 3L23PC, L22P, P, — . The most common types include L66L27PC, L33L23PC, 3L23PC, and P. Distinct symmetry elements, which manifest depending on formation conditions, include the L3 axis, L2 axes, pseudo-L6 axes, pseudo-L2 axes, and pseudo-planes. Quartz crystals can grow suspended, within homogeneous two-sided or one-sided films, attached to the substrate, or to the rock wall. The environment can be conditionally stationary, translationally moving, and/or rotating. This also applies to polyhedral. Various types of symmetry for the medium and the crystal are possible. The orientation of these elements can coincide or differ. For all theoretically possible scenarios, all pseudosymmetry types mentioned above were identified. Each type corresponds to one or several of the described mineral-forming situations. The study examines all theoretically possible scenarios and their corresponding pseudosymmetry types. It is emphasized that а numerous hexagonal-dipyramidal and hexagonal-short-prismatic crystals of "Marmarosh diamonds" from the Krosno Zone of the Ukrainian Carpathians (near the new Beskyd Tunnel) indicate their formation through rotation in a high-symmetry environment at the early stages of mineral formation. Particularly valuable are the polyhedra with P symmetry, as they provide insights into not only the symmetry of the environment but often the direction of movement of the mineral-forming fluids. This is demonstrated, for instance, in the quartz from cross-cutting veins in granodiorites of the Andean intrusive complex on Berthelot Islands (Argentine Islands, Western Antarctica). Ultimately, since the external shape of a polyhedron can reconstruct environmental parameters, the study, based on general theoretical premises and reasoning, explores the relationship between the symmetry of real quartz polyhedra and the symmetry of the fluid mineral-forming environment, its evolution, and the directions of mineral-forming fluids. Specific defining elements of this relationship are primarily illustrated through the author’s data on the morphology of "Marmarosh diamonds", whose polyhedron shapes can preliminarily serve as indicators of the hydrocarbon potential of territories.
Keywords: quartz, "Marmarosh diamonds", crystal genesis, goniometry, inclusions of fluid mineral-forming environment, hydrocarbons.
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