New chemical analyses, electron and X-ray powder diffraction data, and comparison with gyrolite and reyerite shows the ideal formula for tungusite. 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 includes tungusite (x = y = z = 0, M = Fe2+) and gyrolite (x = 1, y = 1, z = 6, M = Ca). -from Authors
Tungusite: new data, relationship and structural model / G. Ferraris, A. Pavese, S. Soboleva. - In: MINERALOGICAL MAGAZINE. - ISSN 0026-461X. - 59:3(1995), pp. 535-543.
Tungusite: new data, relationship and structural model
A. PaveseSecondo
;
1995
Abstract
New chemical analyses, electron and X-ray powder diffraction data, and comparison with gyrolite and reyerite shows the ideal formula for tungusite. 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 includes tungusite (x = y = z = 0, M = Fe2+) and gyrolite (x = 1, y = 1, z = 6, M = Ca). -from Authors
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