Merohedral Mechanism Twining Growth of Natural Cation-Ordered Tetragonal Grossular
Garnet supergroup minerals are in the interest of different applications in geology, mineralogy, and petrology and as optical material for material science. The growth twins of natural tetragonal grossular from the Wiluy River, Yakutia, Russia, were investigated using single-crystal X-ray diffractio...
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ftmdpi:oai:mdpi.com:/2073-4352/12/11/1638/ 2023-08-20T04:10:20+02:00 Merohedral Mechanism Twining Growth of Natural Cation-Ordered Tetragonal Grossular Taras L. Panikorovskii Irina O. Galuskina Vladimir N. Bocharov Vladimir V. Shilovskikh Evgeny V. Galuskin 2022-11-14 application/pdf https://doi.org/10.3390/cryst12111638 EN eng Multidisciplinary Digital Publishing Institute Mineralogical Crystallography and Biomineralization https://dx.doi.org/10.3390/cryst12111638 https://creativecommons.org/licenses/by/4.0/ Crystals; Volume 12; Issue 11; Pages: 1638 grossular twin merohedral twinning hydrogarnet defect cation ordering crystal structure garnet Text 2022 ftmdpi https://doi.org/10.3390/cryst12111638 2023-08-01T07:20:21Z Garnet supergroup minerals are in the interest of different applications in geology, mineralogy, and petrology and as optical material for material science. The growth twins of natural tetragonal grossular from the Wiluy River, Yakutia, Russia, were investigated using single-crystal X-ray diffraction, optical studies, Raman spectroscopy, microprobe, and scanning electron microscopy. The studied grossular is pseudo-cubic (a = 11.9390 (4), c = 11.9469 (6) Å) and birefringent (0.01). Its structure was refined in the Ia3¯d, I41/acd, I41/a, and I4¯2d space groups. The I41/a space group was chosen as the most possible one due to the absence of violating reflections and ordering of Mg2+ and Fe3+ in two independent octahedral sites, which cause the symmetry breaking according to the group–subgroup relation Ia3¯d → I41/a. Octahedral crystals of (H4O4)4−-substituted grossular are merohedrally twinned by twofold axis along [110]. The mechanism of twining growth led to the generation of stacking faults on the (110) plane and results in the formation of crystals with a long prismatic habit. Text Yakutia MDPI Open Access Publishing Crystals 12 11 1638 |
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grossular twin merohedral twinning hydrogarnet defect cation ordering crystal structure garnet |
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grossular twin merohedral twinning hydrogarnet defect cation ordering crystal structure garnet Taras L. Panikorovskii Irina O. Galuskina Vladimir N. Bocharov Vladimir V. Shilovskikh Evgeny V. Galuskin Merohedral Mechanism Twining Growth of Natural Cation-Ordered Tetragonal Grossular |
topic_facet |
grossular twin merohedral twinning hydrogarnet defect cation ordering crystal structure garnet |
description |
Garnet supergroup minerals are in the interest of different applications in geology, mineralogy, and petrology and as optical material for material science. The growth twins of natural tetragonal grossular from the Wiluy River, Yakutia, Russia, were investigated using single-crystal X-ray diffraction, optical studies, Raman spectroscopy, microprobe, and scanning electron microscopy. The studied grossular is pseudo-cubic (a = 11.9390 (4), c = 11.9469 (6) Å) and birefringent (0.01). Its structure was refined in the Ia3¯d, I41/acd, I41/a, and I4¯2d space groups. The I41/a space group was chosen as the most possible one due to the absence of violating reflections and ordering of Mg2+ and Fe3+ in two independent octahedral sites, which cause the symmetry breaking according to the group–subgroup relation Ia3¯d → I41/a. Octahedral crystals of (H4O4)4−-substituted grossular are merohedrally twinned by twofold axis along [110]. The mechanism of twining growth led to the generation of stacking faults on the (110) plane and results in the formation of crystals with a long prismatic habit. |
format |
Text |
author |
Taras L. Panikorovskii Irina O. Galuskina Vladimir N. Bocharov Vladimir V. Shilovskikh Evgeny V. Galuskin |
author_facet |
Taras L. Panikorovskii Irina O. Galuskina Vladimir N. Bocharov Vladimir V. Shilovskikh Evgeny V. Galuskin |
author_sort |
Taras L. Panikorovskii |
title |
Merohedral Mechanism Twining Growth of Natural Cation-Ordered Tetragonal Grossular |
title_short |
Merohedral Mechanism Twining Growth of Natural Cation-Ordered Tetragonal Grossular |
title_full |
Merohedral Mechanism Twining Growth of Natural Cation-Ordered Tetragonal Grossular |
title_fullStr |
Merohedral Mechanism Twining Growth of Natural Cation-Ordered Tetragonal Grossular |
title_full_unstemmed |
Merohedral Mechanism Twining Growth of Natural Cation-Ordered Tetragonal Grossular |
title_sort |
merohedral mechanism twining growth of natural cation-ordered tetragonal grossular |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/cryst12111638 |
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Yakutia |
genre_facet |
Yakutia |
op_source |
Crystals; Volume 12; Issue 11; Pages: 1638 |
op_relation |
Mineralogical Crystallography and Biomineralization https://dx.doi.org/10.3390/cryst12111638 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/cryst12111638 |
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1638 |
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