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Tungusite: new data, relationship with gyrolite and structural model

Published online by Cambridge University Press:  05 July 2018

Giovanni Ferraris ,
Alessandro Pavese  and
Svetlana V. Soboleva
Giovanni Ferraris
Affiliation:
Dip. Scienze Mineralogiche e Petrologiche, Univ. Torino, Via Valperga Caluso 37, 10125 Torino, Italy
Alessandro Pavese
Affiliation:
Dip. Scienze della Terra, Sez. Mineralogia, Univ. Milano, Via Botticelli 23, 20133 Milano, Italy
Svetlana V. Soboleva
Affiliation:
Inst. Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Acad. Sci., Staromonetny per. 35, Moscow, Russia
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Abstract

New chemical analyses, electron and X-ray powder diffraction data, and comparison with gyrolite and reyerite show that tungusite has the ideal formula , symmetry P and a = 9.714(9), b = 9.721(9), c = 22.09(3), α = 90.13(1)°, β = 98.3(2)°, γ = 120.0(1)°, Z = 1. A structural model for tungusite is derived by splitting the double tetrahedral layer of reyerite and inserting a trioctahedral X sheet which is ideally occupied by Fe2+. Polytypism phenomena due to different relative positions between tetrahedral and X sheets are discussed. A substitutional solid solution represented by the formula [Ca14(OH)8]Si24−yAlyO60[NaxM9−(x+z)□z(OH)14−(x+y+2z)·(x+y+2z)H2O] includes tungusite (x = y = z = 0, M = Fe2+ and gyrolite (x = 1, y = 1, z = 6, M = Ca).

Keywords

tungusitereyeritegyrolitestructural model
Type
Mineralogy
Information
Mineralogical Magazine , Volume 59 , Issue 396 , September 1995 , pp. 535 - 543
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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