Journal of Geosciences (Czech Republic), pages 25-36

Magnesiovesuvianite, Ca19Mg(Al,Mg)12Si18O69(OH)9, a new vesuvianite-group mineral

Panikorovskii T.L., Shilovskikh V.V., Avdontseva E.Y., Zolotarev A.A., Karpenko V.Y., Mazur A.S., Yakovenchuk V.N., Bazai A.V., Krivovichev S.V., Pekov I.V.
Publication type: Journal Article
Publication date: 2017-04-25
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Impact factor: 1.4
ISSN: 18026222, 18031943
General Earth and Planetary Sciences
Abstract
Magnesiovesuvianite (IMA 2015-104), ideally Ca19Mg(Al,Mg)12 Si18O69(OH)9, a new vesuvianite-group member, was found in an old museum specimen labelled as vesuvianite from the Tuydo combe, near Lojane, Republic of Macedonia. It occurs as radiating aggregates up to 2 cm across consisting of acicular tetragonal crystals (up to 7 mm long and 5-40 μm thick) with distinct fibre-optic effect. Associated minerals are calcite, grossular-andradite and clinochlore. Single crystals of magnesiovesuvianite are transparent, light pink with a silky lustre. Dominant crystal forms are {100}, {110}, {101} and {001}. The Mohs’ hardness is 6. The measured and calculated densities are 3.30(3) and 3.35 g/cm3, respectively. Mineral is optically uniaxial, negative, ω = 1.725(2), ε = 1.721(2). The chemical composition (wt. % electron-microprobe data) is: SiO2 36.73, Al2O3 20.21, CaO 36.50, MgO 1.80, MnO 0.18, FeO 0.04, Na2O 0.01, H2O 3.10, total 98.37. The empirical formula based on 19 (Ca + Na) apfu is: (Ca18.99Na0.01)Σ19.00 (Mg0.60Al0.40)Σ1.0011.05Mg0.70Mn0.07Fe0.02)Σ11.84 Si17.84O68.72(OH)9. Absorption bands in the IR spectrum are: 393, 412, 443, 492, 576, 606, 713, 802, 906, 968, 1024, 3200, 3450, 3630 cm-1. The eight strongest lines of the powder X-ray diffraction pattern are (I-d(Å)-hkl): 23-10.96-110, 22-3.46-240, 33-3.038-510, 100-2.740-432, 21-2.583-522, 94-2.365-620, 19-2.192-710, 25-1.6165-672. Magnesiovesuvianite is tetragonal, space group P4/n, unit-cell parameters refined from the powder data are a 15.5026(3), c 11.7858(5), V 2832.4(2) Å3, Z = 2. The crystal structure has been refined to R1 = 0.027 for 3266 unique observed reflections with |Fo| ≤ 4σF. The structure refinements provided scattering factors of the Y1A,B sites close to 12 e- that support predominant occupancy of these sites by the Mg2+ cations, in perfect agreement with the 27Al MAS NMR data. Magnesiovesuvianite is a member of the vesuvianite group with Mg2+ as a dominant cation at the Y1 site. The name magnesiovesuvianite is given to highlight the species-defining role of Mg.
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Panikorovskii T.L. et al. Magnesiovesuvianite, Ca19Mg(Al,Mg)12Si18O69(OH)9, a new vesuvianite-group mineral // Journal of Geosciences (Czech Republic). 2017. pp. 25-36.
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Panikorovskii T.L., Shilovskikh V.V., Avdontseva E.Y., Zolotarev A.A., Karpenko V.Y., Mazur A.S., Yakovenchuk V.N., Bazai A.V., Krivovichev S.V., Pekov I.V. Magnesiovesuvianite, Ca19Mg(Al,Mg)12Si18O69(OH)9, a new vesuvianite-group mineral // Journal of Geosciences (Czech Republic). 2017. pp. 25-36.
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TY - JOUR
DO - 10.3190/jgeosci.229
UR - https://doi.org/10.3190%2Fjgeosci.229
TI - Magnesiovesuvianite, Ca19Mg(Al,Mg)12Si18O69(OH)9, a new vesuvianite-group mineral
T2 - Journal of Geosciences (Czech Republic)
AU - Panikorovskii, T L
AU - Shilovskikh, V V
AU - Avdontseva, E Y
AU - Zolotarev, A A
AU - Karpenko, V Y
AU - Mazur, A S
AU - Yakovenchuk, V N
AU - Bazai, A V
AU - Krivovichev, S V
AU - Pekov, I V
PY - 2017
DA - 2017/04/25 00:00:00
PB - Czech Geological Society
SP - 25-36
SN - 1802-6222
SN - 1803-1943
ER -
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@article{2017,
author = {T L Panikorovskii and V V Shilovskikh and E Y Avdontseva and A A Zolotarev and V Y Karpenko and A S Mazur and V N Yakovenchuk and A V Bazai and S V Krivovichev and I V Pekov},
title = {Magnesiovesuvianite, Ca19Mg(Al,Mg)12Si18O69(OH)9, a new vesuvianite-group mineral},
journal = {Journal of Geosciences (Czech Republic)},
year = {2017},
publisher = {Czech Geological Society},
month = {apr},
url = {https://doi.org/10.3190%2Fjgeosci.229},
pages = {25--36},
doi = {10.3190/jgeosci.229}
}
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