... positions and that this is accentuated in biotites from metamorphic rocks. Tetrahedral Fe 3+ ions were confirmed in ferriphlogopite, ferriannites from banded iron formations, and some annites. Annite from the type locality in Massachusetts contains high concentrations of octahedral Fe 2+ and Fe 3+ cations...

... of sodium ions in the formation of grunerite and the micaceous phases was demonstrated by similar experiments using KOH as a solvent which produced no amphibole and only the mica, ferriannite. 1 Research sponsored by the U. S. Atomic Energy Commission under contract with the Union Carbide...

... evolution of micas in the Rožná and Dobrá Voda pegmatites, Czech Republic. Mineralogy and Petrology , 55 , 177 –201. Comodi, P., Zanazzi, P.F., Weiss, Z., Rieder, M., and Drábek, M. ( 1999 ) “Cs-tetra-ferriannite”: High-pressure and high-temperature behavior of a potential nuclear waste disposal...

... annite and ferriannite. Diffraction techniques were used to investigate structural changes and phase transitions induced by heat treatment on Fe-bearing natural and synthetic trioctahedral micas, and particularly on phlogopite. After studies on synthetic fluorophlogopite ( Takeda and Morosin 1975...

.... , Rieder , M. , and Drábek , M. ( 1996 ) Cs-ferriannite as a possible host for waste cesium: crystal structure and synthesis . European Journal of Mineralogy , 8 , 1265 – 1271 . Miller , A.K. , Guggenheim , S. , and Koster von Groos , A. ( 1991 ) The incorporation of water...

... in biotite . The Canadian Mineralogist , 30 , 343 – 354 . Mellini , M. , Weiss , Z. , Rieder , M. and Drabek , M. ( 1996 ) Cs-ferriannite as a possible host for waste cesium; crystal structure and synthesis . European Journal of Mineralogy , 8 , 1265 – 1271 . Munoz , J.L...

.... , Rieder , M. , Drábek , M. ( 1996 ): Cs-ferriannite as a possible host for waste cesium: crystal structure and synthesis . Eur. J. Mineral ., 8 , 1265 – 1271 . Rieder , M. , Cavazzini , G. , D’yakonov , Yu.S. , Frank-Kamenetskii , VA. , Gottardi , G. , Guggenheim...

... ) Mössbauer and X-ray studies on the oxidation of annite and ferriannite. Physics and Chemistry of Minerals , 14 , 270 –275. Ferrow, E. and Annersten, H. ( 1984 ) Ferric iron in tri-octahedral micas. University of Uppsala Department of Mineralogy and Petrology Research Report , 39 , 22 p. Forbes...

... 2 )(Si 3 Al)O 10 (OH) 2 −8.32 −4647.86 −4653.89 −0.13 Ferriannite 6 (K)(Fe 3 2+ )(Si 3 Fe 3+ )O 10 (OH) 2 11.07 −4430.47 −4460.22 −0.67 Talc-Mn 7 (Mn 3 )(Si 4 )O 10 (OH) 2 −4816.62 −4860.84 −0.92 Talc-Co 7 (Co 3 )(Si 4 )O 10 (OH) 2 −4272.70 −4383.02 −2.58 Talc...

... flattened interlayer and octahedral sites over the unheated sample. Comodi et al. (1999) discussed the structural aspects observed in Fe-oxidation mechanisms in a synthetic Cs-tetra-ferriannite single crystal through bond-length changes and a kinetic study of cell parameters. Tutti et al. (2000...

... if this proportion is small, e.g . 0.01−0.02 in the structure of Cs-ferriannite ( Mellini et al. , 1996 ). Ms.805; A.E. Peter J. Heaney The study was supported by grants 203/99/0067, 202/03/0430 and 205/03/0439 of the Grant Agency of the Czech Republic. The authors are grateful to G. Ferraris, C.A...

... –O1̂ – O1, or O1 – O1̂ – O2 angle). Micas of the phlogopite-annite join show μ values close to zero (0 ≤ μ ≤ 0.62°). The minimum values are from crystals containing Fe 3+ in tetrahedral sites [e.g., synthetic Cs-tetra-ferriannite ( Mellini et al. 1996 ), tetra-ferriphlogopite and [IV] Fe 3...

... , 475 – 484 . Farmer , V.C. and Wilson , M.J. ( 1970 ) Experimental conversion of biotite to hydroxybiotite . Nature , 226 , 841 – 842 . Ferrow , E. ( 1987 ) Mössbauer and X-ray studies on the oxidation of annite and ferriannite . Physics and Chemistry of Minerals...

.... Rev. B , 11 , 2795 . Mattheiss , L. ( 1964 ): Energy bands for the iron transition series . Phys. Rev. A , 134 , 970 . Mellini , M. , Weiss , Z. , Rieder , M. , Drábek , M. ( 1996 ): Cs-ferriannite as a possible host for waste cesium: crystal structure...

... studies. Data were obtained from the following papers: micas: ferriannite-1 M , synthetic ( Donnay et al. , 1964 ), Cs-ferriannite-1 M , syn. ( Mellini et al. , 1996 ), brittle mica anandite-2 O ( Giusepetti and Tadini, 1972 ), phlogopite-1 M ( Hazen et al. , 1981 ), Fe-phlogopite-1 M ( Steinfink...

...+ . American Mineralogist , 90 , 187 – 198 . Ferrow , E.A. ( 1987a ) Mössbauer and X-ray studies on the oxidation of annite and ferriannite. Physics and Chemistry of Minerals , 14 , 270 – 275 . Ferrow , E.A. ( 1987b ) Mössbauer effect and X-ray diffraction studies of synthetic...