The First Find of Mannardite in Russia

Mannardite was found in a type of Cr–V–bearing metamorphic rock of the Slyudyanka complex (South Baikal region). The X-ray data of the mineral are recalculated for three scenarios taking into account possible variations of the mannardite structure. The mean chemical composition is as follows (14 ana...

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Bibliographic Details
Published in:Doklady earth sciences 2018-03, Vol.479 (1), p.397-400
Main Authors: Reznitsky, L. Z., Sklyarov, E. V., Ushchapovskaya, Z. F., Barash, I. G.
Format: Article
Language:English
Subjects:
Aluminum oxide
Analysis
Barium oxides
Chemical composition
Earth and Environmental Science
Earth Sciences
Geochemistry
Metamorphic rocks
Oxygen
Petrogenesis
Silica
Silicon dioxide
Titanium dioxide
Tunnels
Vanadium oxides
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Summary:Mannardite was found in a type of Cr–V–bearing metamorphic rock of the Slyudyanka complex (South Baikal region). The X-ray data of the mineral are recalculated for three scenarios taking into account possible variations of the mannardite structure. The mean chemical composition is as follows (14 analyses, wt %): 0.11 SiO 2 , 52.08 TiO 2 , 6.19 VO 2 , 13.51 V 2 O 3 , 5.50 Cr 2 O 3 , 0.24 Al 2 O 3 , 0.16 Fe 2 O 3 , 0.05 MgO, 20.09 BaO, 2.09 H 2 O (the H 2 O, VO 2 , and V 2 O 3 contents are recalculated). The formula of the mean composition is (Ba 1.06 H 2 O 0.94 )(Ti 5.27 Si 0.21 V 0.61 4+ V 1.45 3+ Cr 0.59 Fe 0.02 Mg 0.01 )O 16 . Mannardite is characterized by the presence of different valent V. The mineral can be hydrous with molecular H 2 O or hydroxylion in tunnels or anhydrous. Mannardite can be considered an indicator of the hydroxyl or oxygen regime of petrogenetic processes.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X18030285