Hydrothermal experiments aimed at the synthesis of trioctahedral ferruginous Cs micas were carried out at 100 MPa and a constant temperature in the range 500-710 degrees C or in a temperature gradient. Starting mixes consisted of SiO(2), Fe(2)O(3), Al(2)O(3), Cs(2)CO(3); there was excess water in all runs, and in some runs also an excess of CsOH or Cs(2)CO(3) in solution. Two micas were grown with good yields, the Cs analog of annite and the Cs analog of tetra-ferri-annite. The former is usually accompanied by variable quantities of pollucite (+/- magnetite) or fayalite. An almost Al-free "Cs-tetra-ferri-annite" was synthesized from an aluminous mix in thermal gradient runs, and a pure "Cs-tetra-ferri-annite" was synthesized from an Al-free oxide mix. Rietveld refinement of the structure of "Cs-annite" shows it to be similar to the structures of annite, tetra-ferri-annite, and "Cs-tetra-ferri-annite", which has the largest unit-cell of any mica synthesized. to date.

Drabek, M., Rieder, M., Viti, C., Weiss, Z., & Fryda, J. (1998). Hydrothermal synthesis of a Cs ferruginous trioctahedral mica. CANADIAN MINERALOGIST, 36(3), 755-761.

Hydrothermal synthesis of a Cs ferruginous trioctahedral mica

VITI, C.;
1998

Abstract

Hydrothermal experiments aimed at the synthesis of trioctahedral ferruginous Cs micas were carried out at 100 MPa and a constant temperature in the range 500-710 degrees C or in a temperature gradient. Starting mixes consisted of SiO(2), Fe(2)O(3), Al(2)O(3), Cs(2)CO(3); there was excess water in all runs, and in some runs also an excess of CsOH or Cs(2)CO(3) in solution. Two micas were grown with good yields, the Cs analog of annite and the Cs analog of tetra-ferri-annite. The former is usually accompanied by variable quantities of pollucite (+/- magnetite) or fayalite. An almost Al-free "Cs-tetra-ferri-annite" was synthesized from an aluminous mix in thermal gradient runs, and a pure "Cs-tetra-ferri-annite" was synthesized from an Al-free oxide mix. Rietveld refinement of the structure of "Cs-annite" shows it to be similar to the structures of annite, tetra-ferri-annite, and "Cs-tetra-ferri-annite", which has the largest unit-cell of any mica synthesized. to date.
Drabek, M., Rieder, M., Viti, C., Weiss, Z., & Fryda, J. (1998). Hydrothermal synthesis of a Cs ferruginous trioctahedral mica. CANADIAN MINERALOGIST, 36(3), 755-761.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11365/10453
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