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Natromelansonite, Na3Zr[Si7AlO19]⋅4–5H2O, a new member of the rhodesite mero-plesiotype series from Mont Saint-Hilaire, Quebec, Canada

Published online by Cambridge University Press:  15 January 2024

Inna Lykova Open the ORCID record for Inna Lykova [Opens in a new window] ,
Ralph Rowe Open the ORCID record for Ralph Rowe [Opens in a new window] ,
Glenn Poirier ,
Henrik Friis Open the ORCID record for Henrik Friis [Opens in a new window]  and
Stephanie Barnes Open the ORCID record for Stephanie Barnes [Opens in a new window]
Inna Lykova*
Affiliation:
Canadian Museum of Nature, PO Box 3443, Station “D”, Ottawa, Ontario K1P 6P4, Canada
Ralph Rowe
Affiliation:
Canadian Museum of Nature, PO Box 3443, Station “D”, Ottawa, Ontario K1P 6P4, Canada
Glenn Poirier
Affiliation:
Canadian Museum of Nature, PO Box 3443, Station “D”, Ottawa, Ontario K1P 6P4, Canada
Henrik Friis
Affiliation:
Natural History Museum, University of Oslo, PO Box 1172, Blindern, 0318 Oslo, Norway
Stephanie Barnes
Affiliation:
Canadian Conservation Institute, 1030 Innes Road, Ottawa, Ontario K1B 4S7, Canada
*
Corresponding author: Inna Lykova; Email: ilykova@nature.ca
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Abstract

Natromelansonite, Na3Zr[Si7AlO19]⋅4–5H2O, was found at the Poudrette (Demix) quarry, Mont Saint-Hilaire, Quebec, Canada in a highly altered pegmatite together with a clay mineral, steacyite, polylithionite and rhodochrosite. It occurs as an outer zone of tabular crystals to 0.1 × 0.3 × 1 mm in size flattened on (001). The inner zone is made of melansonite. The mineral is grey with white powder colour and vitreous lustre. The cleavage is parallel to {010}, perfect. The Mohs hardness is 3.5. The mineral has green fluorescence under short-wave ultraviolet light. The Dcalc is 2.31 g/cm3. The infrared spectrum is reported. The composition (wt.%, average of 8 analyses) is Na2O 10.08, K2O 1.72, CaO 0.24, BaO 0.32, MnO 0.10, Al2O3 6.86, Y2O3 0.35, Yb2O3 0.55, SiO2 56.23, ZrO2 14.78, H2O 9.52, total 100.75. The empirical formula calculated on the basis of O = 23 apfu and H = 8 apfu is Na(□Na0.38Ca0.02Mn0.01)2(Na0.70K0.28Ba0.02)Σ1.00(Zr0.91Y0.02Yb0.02)Σ0.95(Si7.08Al1.02)Σ8.10O19⋅4H2O. The mineral is monoclinic, P21/m, a = 6.5156(3) Å, b = 24.061(1) Å, c = 6.9759(6) Å, β = 90.453(5)° and V = 1093.61(9) Å3 and Z = 2. The strongest reflections of the powder X-ray diffraction pattern [d,Å(I)(hkl)] are: 12.02(100)(020), 6.97(89)(001), 6.51(39)(100), 3.416(37)(160), 3.062(42)($\bar{1}$61, 102, 161 and $\bar{1}$12), 3.018(38)(230 and 042), 2.864(40)(240 and 132). The crystal structure, solved and refined from single-crystal X-ray diffraction data (R1 = 0.042), is based on a double sheet of tetrahedra (T) and a sheet of octahedra (O) that alternate along the [010] direction forming a TOT structure typical for members of the rhodesite mero-plesiotype series.

Keywords

natromelansonitenew mineralcrystal structuremero-plesiotype seriesMont Saint-Hilaire
Type
Article
Information
Mineralogical Magazine , Volume 88 , Issue 2 , April 2024 , pp. 195 - 202
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland

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Footnotes

Associate Editor: Sergey V Krivovichev

References

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