Lizardite “kolskite” from the Lesnaya Varaka alkaline ultrabasic massif (Kola peninsula): new data
https://doi.org/10.32454/0016-7762-2024-66-2-101-111
Abstract
Background. A rare morphological variety of magnesian serpentine, described in 1939 in the veins of the Lesnaya Varaka alkaline ultrabasic massif (Kola Peninsula) under the name “kolskite” is studied. For a long time, this variety has been considered an antigorite.
Aim. Identification of the polymorphic modification of “worm-like” serpentine; determination of its crystal chemical features and possible genesis.
Materials and methods. Samples were studied using electron probe analysis and scanning electron microscopy by a Jeol JSM-IT500 scanning electron microscope equipped with an INCA X-Max energy dispersion spectrometer; powder X-ray diffraction; infrared spectroscopy using a FSM-1201 IR Fourier spectrometer; and Raman spectroscopy using a EnSpectr R532 spectrometer.
Results. Serpentine “kolskite” is represented by lizardite with the empirical formula (Mg2.79Al0.04Fe3+0.01)∑2.84[Si2.06O5](OH)4. The calculated parameters of the trigonal unit cell are as follows: a = 5.32(1) Å, c = 7.88(2) Å, V = 193.0(1) Å3. An increase in parameter c compared to that of apoolivine lizardite typical of ultrabasic objects indicates an expansion of the interlayer distance and is associated with serpentine hydration.
Conclusion. The formation of “worm-like” lizardite aggregates could occur either by replacing vermiculite under the action of low-temperature alkaline hydrothermal solutions, or as a result of hypergenic alteration in the earlier apoolivine serpentine.
About the Author
M. O. Bulakh
Lomonosov Moscow State University
Russian Federation
Russian Federation
Maria O. Bulakh — Cand. Sci. (Geol.-Min.), junior researcher, Department of Mineralogy, Geological Faculty
1, Leninskie Gory, Moscow 119991
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Review
For citations:
Bulakh M.O. Lizardite “kolskite” from the Lesnaya Varaka alkaline ultrabasic massif (Kola peninsula): new data. Proceedings of higher educational establishments. Geology and Exploration. 2024;66(2):101-111. (In Russ.) https://doi.org/10.32454/0016-7762-2024-66-2-101-111
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