Suhailite, a new ammonium trioctahedral mica

2009 ◽  
Vol 94 (2-3) ◽  
pp. 210-221 ◽  
Author(s):  
M. D. R. Cruz ◽  
C. S. de Galdeano
Keyword(s):  
Trioctahedral Mica

Layer-silicates in the contact zone between granite and serpentinite, jordanów, lower Silesia, Poland

Clay Minerals ◽  
1988 ◽  
Vol 23 (4) ◽  
pp. 459-470 ◽  
Author(s):  
E. Dubińska ◽  
A. Wiewióra
Keyword(s):  
Experimental Data ◽  
Contact Zone ◽  
Spatial Relations ◽  
Tectonic Events ◽  
Mineral Development ◽  
Tentative Model ◽  
Mineral Assemblages ◽  
Geological Evolution ◽  
Trioctahedral Mica ◽  
Lower Silesia

AbstractChlorite belonging to subfamily C, vermiculite 2MB-VII-meso, talc and a monoclinic amphibole were identified in rocks from a contact zone between highly tectonized granite and serpentinite at Jordanów, Lower Silesia, Poland. K-saturated vermiculite readily produced a phlogopite-like structure 1M-I (3TA-IV) indicating trioctahedral mica to be its precursor. Spatial relations of the mineral assemblages were compared with published experimental data and used to produce a tentative model of the geological evolution of the rocks and minerals, which include four episodes of mineral development separated by three tectonic events.

Weathering of phlogopite by Bacillus cereus and Acidithiobacillus ferrooxidans

2004 ◽  
Vol 50 (3) ◽  
pp. 213-219 ◽  
Author(s):  
Iveta Štyriaková ◽  
Tariq M Bhatti ◽  
Jerry M Bigham ◽  
Igor Štyriak ◽  
Antti Vuorinen ◽  
...  
Keyword(s):  
Bacillus Cereus ◽  
Key Words ◽  
Acidithiobacillus Ferrooxidans ◽  
Solid Phase ◽  
Chemical Dissolution ◽  
X Ray Diffraction ◽  
Characteristic Peak ◽  
X Ray ◽  
Before And After ◽  
Trioctahedral Mica

The purpose of this study was to assess the weathering of finely ground phlogopite, a trioctahedral mica, by placing it in contact with heterotrophic (Bacillus cereus) and acidophilic (Acidithiobacillus ferrooxidans) cultures. X-ray diffraction analyses of the phlogopite sample before and after 24 weeks of contact in B. cereus cultures revealed a decrease in the characteristic peak intensities of phlogopite, indicating destruction of individual structural planes of the mica. No new solid phase products or interlayer structures were detected in B. cereus cultures. Acidithiobacillus ferrooxidans cultures enhanced the chemical dissolution of the mineral and formed partially weathered interlayer structures, where interlayer K was expelled and coupled with the precipitation of K-jarosite [KFe3(SO4)2(OH)6].Key words: Acidithiobacillus ferrooxidans, Bacillus cereus, mica, phlogopite, weathering.

The study of thermal expansion of di- and trioctahedral mica

1984 ◽  
Vol 40 (a1) ◽  
pp. C149-C149
Author(s):  
M. S. Metsik ◽  
V. M. Kalichman ◽  
G. A. Kuznetsova
Keyword(s):  
Thermal Expansion ◽  
Trioctahedral Mica

scholarly journals Crystal-chemistry of micas belonging to the yangzhumingite-fluorophlogopite and phlogopite-fluorophlogopite series from the Apuan Alps (northern Tuscany, Italy)

2020 ◽  
Vol 47 (12) ◽  
Author(s):  
Maria Lacalamita ◽  
Emanuela Schingaro ◽  
Ernesto Mesto ◽  
Federica Zaccarini ◽  
Cristian Biagioni
Keyword(s):  
Raman Spectroscopy ◽  
Chemical Characterization ◽  
Unit Cell ◽  
Crystal Chemical ◽  
Chemical Formula ◽  
Crystal Chemical Formula ◽  
Unit Cell Parameters ◽  
Cell Parameters ◽  
Trioctahedral Mica ◽  
Apuan Alps

AbstractThe present work reports the crystal-chemical characterization of micas from the Monte Arsiccio and Buca della Vena mines (Apuan Alps, Italy) through electron microprobe analysis, single-crystal X-ray diffraction, and Raman spectroscopy. The sample from the Monte Arsiccio mine can be classified as an intermediate member of the yangzhumingite-fluorophlogopite series, with average crystal-chemical formula (K0.85Na0.01Ba0.09)Σ=0.95(Mg2.11Fe2+0.23Fe3+0.11Cr3+0.01Al0.20Ti0.04☐0.30)Σ=3.00(Si3.20Al0.80)Σ=4.00O10.00F1.90Cl0.02(OH)0.08. Unit-cell parameters are a ~ 5.30, b ~ 9.18, c ~ 10.14 Å, β ~ 100.12°, V ~ 486.22 Å3, corresponding to the 1M polytype. Structure refinements, performed in C2/m space group, converged to R1 = 3.54 and 4.46% and provided Mg plus Fe occupancy in the range 86–94% for the octahedral M1 and M2 sites. Raman spectroscopy shows very weak bands in the OH stretching region at ~ 3690 and 3580 cm−1. The sample from the Buca della Vena mine has been identified as an (OH)-rich fluorophlogopite, with average crystal-chemical formula (K0.84Na0.02Ca0.01)Σ=0.87(Mg2.12Fe2+0.55Fe3+0.10Al0.18☐0.05)Σ=3.00(Si2.99Al1.01)Σ=4.00O10.00F1.02Cl0.09(OH)0.89. Its unit-cell parameters are a ~ 5.33, b ~ 9.22, c ~ 10.23 Å, β ~ 100.09°, V ~ 494.39 Å3. Structure refinements gave good R1 values (3.27 and 4.37%) and revealed octahedral occupancy of 82–84% Mg and 16–18% Fe. Strong Raman signals at ~ 3702 cm−1 and 3595 cm−1 were observed in the OH stretching region. The findings allow to better understand not only the mineralogy of the Apuan Alps but, more generally, the crystal chemical details of intermediate dioctahedral-trioctahedral mica belonging to the yanzhumingite-fluorophlogopite series.

Magnetic behaviour of trioctahedral mica-2M1 occurring in a magnetic anomaly zone

2008 ◽  
Vol 72 (5) ◽  
pp. 1035-1042 ◽  
Author(s):  
S. Pini ◽  
M. Affronte ◽  
M. F. Brigatti
Keyword(s):  
Magnetic Susceptibility ◽  
Peak Position ◽  
Magnetic Behaviour ◽  
Ac Magnetic Susceptibility ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
Trioctahedral Mica ◽  
Two Peaks ◽  
X Ray Absorption

AbstractThis work relates the crystal chemistry and the magnetic behaviour of a trioctahedral mica (chemical formula: (K0.90Na0.01Ca0.01Ba0.01 ☐0.07)(Al0.05Fe2+1.10Mg1.38Ti0.32Mn0.01☐0.04)(Al1.12Si2.88)O10 (F0.27OH1.27O0.46); unit cell parameters: a = 5.345(2) Å, b = 9.261(4) Å, c = 20.189(8) Å; β = 95.075(8)°) from Minto Block (Ungava peninsula, northern Quebec, Canada), a region characterized by high magnetic anomalies. Crystallographic and X-ray absorption spectroscopy data suggest a prevalent divalent oxidation state for Fe and a disordered Fe 2+ distribution in the two octahedral sites Ml and M2. The real part of magnetic susceptibility shows two peaks at ∼5.2 K and 120 K. However, as demonstrated by AC magnetic susceptibility measurements, the origin of the two effects is different: the peak position of the first one (i.e. the effect revealed at 5.2 K) is frequency-dependent, thus suggesting a spin-glass like behaviour. The effect at 120 K can instead be attributed to the occurrence of diluted phases in mica matrix, such as Fe oxides.

Another insight into illitization by K-Ar dating of micro- to nano-metric illite-type particles exchanged with alkylammonium cations

Clay Minerals ◽  
2011 ◽  
Vol 46 (4) ◽  
pp. 593-612 ◽  
Author(s):  
N. Clauer
Keyword(s):  
Chemical Composition ◽  
Size Fraction ◽  
Chemical Compositions ◽  
Size Fractions ◽  
Independent Particle ◽  
Before And After ◽  
Two Generations ◽  
Trioctahedral Mica ◽  
Mixed Layers ◽  
Alkylammonium Exchange

AbstractMicrometric and nanometric illite-rich size fractions of claystones, bentonites and shales were exchanged with alkylammonium cations that have the specificity of stoichiometrically replacing K in trioctahedral mica interlayers. The purpose of the study was a separate evaluation of the K-Ar ages of potentially dioctahedral residual particles not affected by alkylammonium leaching and of potentially trioctahedral illites that were exchanged by the organic molecules.The K-Ar ages of micrometric size fractions from an Estonian Blue Clay sample collected next to another studied previously show that, even if identical in their mineralogical characteristics, the fractions contain variable amounts of trioctahedral particles that are of different origins. The alkylammonium treatment modifies slightly, within analytical uncertainty, the K-Ar ages of the <0.1 and 0.1–0.4 mm size fractions from, respectively, 464±13 and 530±14 Ma before organic exchange to 480 ± 11 and 546±12 Ma after. The K-Ar ages of alkylammonium exchanged nanometric size fractions from the rim and centre of a thick Upper Cretaceous bentonite bed in Montana suggest that trioctahedral illite-rich particles mineralogically and chemically homogeneous and about 30 Ma old precipitated next to older dioctahedral particles of ∼60–65 Ma. The untreated mixtures consist of two generations of authigenic illite having apparently different di/trioctahedral layerings. The same type of authigenic di/trioctahedral illite layering could be demonstrated for nanometric illite particles of a bentonite bed from the East Slovak Basin, one size fraction appearing to even consist of a pure trioctahedral illite as the alkylammonium exchange emptied completely the illite interlayers. The nearby shale level consisted of detrital illite particles that were found to be of different ages, di/trioctahedral layerings and therefore varied origin.K-Ar ages of alkylammonium exchanged micrometric to nanometric illite and illite-smectite mixed layers, either increasing or decreasing, appear to outline variable di/trioctahedral layering assemblages or independent particle mixtures resulting from a more complex smectite illitization process than the conventionally assumed homogeneous reaction. It could record changing chemical compositions of the interacting pore fluid during crystallization, even when illitization progressed slowly. Similar ages before and after alkylammonium exchange suggest a constant chemical composition and therefore an homogeneous dioctahedral crystal structure. Alternatively, a changing chemical composition of the fluids during illitization is potentially recorded by variable K-Ar ages of the alkylammonium-leached illite resulting from differentiated ion exchanges.

Shirozulite, KMn2+3(Si3Al)O10(OH)2, a new manganese-dominant trioctahedral mica: Description and crystal structure

2004 ◽  
Vol 89 (1) ◽  
pp. 232-238 ◽  
Author(s):  
Kiyotaka Ishida ◽  
Frank C. Hawthorne ◽  
Fumitoshi Hirowatari
Keyword(s):  
Crystal Structure ◽  
Trioctahedral Mica

Raman spectra and vibrational analysis of the trioctahedral mica phlogopite

1999 ◽  
Vol 84 (5-6) ◽  
pp. 970-976 ◽  
Author(s):  
David A. McKeown ◽  
Michael I. Bell ◽  
Edgar S. Etz
Keyword(s):  
Raman Spectra ◽  
Vibrational Analysis ◽  
Trioctahedral Mica
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