Single-crystal structure refinements and crystal chemistry of synthetic trioctahedral micas KM3(Al3+,Si4+)4O10(OH)2, where M = Ni2+, Mg2+, Co2+, Fe2+, or Al3+
-
Günther J. Redhammer
and
Georg Roth
Abstract
To study structural changes with changing chemical composition in the octahedral sheet of trioctahedral potassium-rich 1M micas, 3 natural and 12 synthetic micas were examined by singlecrystal X-ray diffraction. Samples with Ni2+, Mg2+, Co2+, Fe2+, and Al3+ in the octahedral sheet and with Si4+, Al3+ and one sample with Ga3+ in the tetrahedral sheet were prepared at high temperatures and pressures, which yielded crystallites ≤200 mm in size. For samples with approximately AlSi3 composition of the tetrahedral sheet and with no octahedral Al3+, mean M1-O and M2-O octahedral bond lengths correlate very well with the mean ionic radius of the octahedral cations. For these samples, the M1 and M2 sites are found to be very similar or identical within experimental error in terms of mean M-O bond lengths, bond angles, and polyhedral distortion parameters. Octahedral distortion is negatively correlated with the size of the octahedral cation. Octahedra in Ni2+-mica show the largest deviation from ideal octahedral geometry, whereas those in annite are closest to ideal octahedral geometry, but they are still significantly flattened. Octahedral Al3+ prefers the M2 site. This causes the mean M1-O bond length to decrease less with increasing Al3+ content as compared to the mean M2-O distance. This Al3+ preference for M2 also causes the M2 site to become smaller and more distorted than the M1 site. Refinement of the Mg-Fe ratios in the octahedral sites along the annite-phlogopite join shows that the two cations are statistically distributed over M1 and M2. Tetrahedra are regular and show only a small elongation along c*. Tetrahedral distortion parameters for the AlSi3 micas show no correlation with chemistry of the octahedral layer. However, the mean T-O bond lengths increase slightly with increasing size of the octahedral cation. With decreasing size of the lateral dimension of the octahedral sheet in the (001) plane, the tetrahedral sheet shows increasing ditrigonal distortion. Largest tetrahedral rotation angles are observed for synthetic near end-member siderophyllite with α = 11.5° and for tetra-gallium-phlogopite KMg3GaSi3O10(OH)2 with α = 10.8°.
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Atomic-scale observations of franckeite surface morphology
- Surface control vs. diffusion control during calcite dissolution: Dependence of step-edge velocity upon solution pH
- First-principles calculation of the infrared spectrum of lizardite
- Hard-mode infrared spectroscopy of perovskites across the CaTiO3-SrTiO3 solid solution
- Spectroscopic studies of spessartine from Brazilian pegmatites
- Order/disorder in natrolite group zeolites: A 29Si and 27Al MAS NMR study
- Evolution of local electronic structure in alabandite and niningerite solid solutions [(Mn,Fe)S, (Mg,Mn)S, (Mg,Fe)S] using sulfur K- and L-edge XANES spectroscopy
- Electron paramagnetic resonance spectroscopic study of synthetic fluorapatite: Part III. Structural characterization of sub-ppm-level Gd and Mn in minerals at W-band frequency
- Experimental determination of the equilibria: rutile + magnesite = geikielite + CO2 and zircon + 2 magnesite = baddeleyite + forsterite + 2 CO2
- Symplectites derived from metastable phases in martian basaltic meteorites
- Copper speciation in vapor-phase fluid inclusions from the Mole Granite, Australia
- Trace-element partitioning between vacancy-rich eclogitic clinopyroxene and silicate melt
- Fluorite particles inducing butterfly aggregates of incipient microperthite in alkali feldspar from a syenite, the Patagonian Andes, southern Chile
- Thermal stability and spectroscopic studies of zemkorite: A carbonate from the Venkatampalle kimberlite of southern India
- Temperatures from triple-junction angles in sulfides
- Experimental determination of calcite solubility in H2O-NaCl solutions at deep crust/ upper mantle pressures and temperatures: Implications for metasomatic processes in shear zones
- Compressibility of stottite, FeGe(OH)6: An octahedral framework with protonated O atoms
- High-pressure behavior of bikitaite: An integrated theoretical and experimental approach
- Raman spectroscopic study of H2O in bikitaite: “One-dimensional ice”
- Hydrogen, lithium, and boron in mantle-derived olivine: The role of coupled substitutions
- Crystal chemistry of three tourmalines by SREF, EMPA, and SIMS
- Revised structure models for antigorite: An HRTEM study
- The structure of Mn-rich tuperssuatsiaite: A palygorskite-related mineral
- Single-crystal structure refinements and crystal chemistry of synthetic trioctahedral micas KM3(Al3+,Si4+)4O10(OH)2, where M = Ni2+, Mg2+, Co2+, Fe2+, or Al3+
- SIMS matrix effects in the analysis of light elements in silicate minerals: Comparison with SREF and EMPA data
- Letters. Equation of state of Al-bearing stishovite to 40 GPa at 300 K
- Order parameter behavior at the structural phase transition in cummingtonite from Mössbauer spectroscopy
- Deciphering Ni sequestration in soil ferromanganese nodules by combining X-ray fluorescence, absorption, and diffraction at micrometer scales of resolution
- Use of the spindle stage for orientation of single crystals for microXAS: Isotropy and anisotropy in Fe-XANES spectra
- A technique for mounting and polishing melt inclusions in small (<1 mm) crystals
Articles in the same Issue
- Atomic-scale observations of franckeite surface morphology
- Surface control vs. diffusion control during calcite dissolution: Dependence of step-edge velocity upon solution pH
- First-principles calculation of the infrared spectrum of lizardite
- Hard-mode infrared spectroscopy of perovskites across the CaTiO3-SrTiO3 solid solution
- Spectroscopic studies of spessartine from Brazilian pegmatites
- Order/disorder in natrolite group zeolites: A 29Si and 27Al MAS NMR study
- Evolution of local electronic structure in alabandite and niningerite solid solutions [(Mn,Fe)S, (Mg,Mn)S, (Mg,Fe)S] using sulfur K- and L-edge XANES spectroscopy
- Electron paramagnetic resonance spectroscopic study of synthetic fluorapatite: Part III. Structural characterization of sub-ppm-level Gd and Mn in minerals at W-band frequency
- Experimental determination of the equilibria: rutile + magnesite = geikielite + CO2 and zircon + 2 magnesite = baddeleyite + forsterite + 2 CO2
- Symplectites derived from metastable phases in martian basaltic meteorites
- Copper speciation in vapor-phase fluid inclusions from the Mole Granite, Australia
- Trace-element partitioning between vacancy-rich eclogitic clinopyroxene and silicate melt
- Fluorite particles inducing butterfly aggregates of incipient microperthite in alkali feldspar from a syenite, the Patagonian Andes, southern Chile
- Thermal stability and spectroscopic studies of zemkorite: A carbonate from the Venkatampalle kimberlite of southern India
- Temperatures from triple-junction angles in sulfides
- Experimental determination of calcite solubility in H2O-NaCl solutions at deep crust/ upper mantle pressures and temperatures: Implications for metasomatic processes in shear zones
- Compressibility of stottite, FeGe(OH)6: An octahedral framework with protonated O atoms
- High-pressure behavior of bikitaite: An integrated theoretical and experimental approach
- Raman spectroscopic study of H2O in bikitaite: “One-dimensional ice”
- Hydrogen, lithium, and boron in mantle-derived olivine: The role of coupled substitutions
- Crystal chemistry of three tourmalines by SREF, EMPA, and SIMS
- Revised structure models for antigorite: An HRTEM study
- The structure of Mn-rich tuperssuatsiaite: A palygorskite-related mineral
- Single-crystal structure refinements and crystal chemistry of synthetic trioctahedral micas KM3(Al3+,Si4+)4O10(OH)2, where M = Ni2+, Mg2+, Co2+, Fe2+, or Al3+
- SIMS matrix effects in the analysis of light elements in silicate minerals: Comparison with SREF and EMPA data
- Letters. Equation of state of Al-bearing stishovite to 40 GPa at 300 K
- Order parameter behavior at the structural phase transition in cummingtonite from Mössbauer spectroscopy
- Deciphering Ni sequestration in soil ferromanganese nodules by combining X-ray fluorescence, absorption, and diffraction at micrometer scales of resolution
- Use of the spindle stage for orientation of single crystals for microXAS: Isotropy and anisotropy in Fe-XANES spectra
- A technique for mounting and polishing melt inclusions in small (<1 mm) crystals
