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ZrO -EMFmeasurementswerecarriedoutonnaturalbiotitesamplesbetweenabout400 and1100Cinaclosedsysteminapureargonatmosphere(99.9999%).TheEMFpatterns arecomplexandcannotbecomparedtoclassicalequilibrium1/T...
Pervasivemetasomatismthatinvolvedtheformationoftourmaline-richrocksandin?ux ofLi,F,andCsintoOrdovicianpsammo-peliticmetasedimentsoccurredintheValde?ores area(Ca!ceres,Spain).NumerousLi-andSn-bearing...
Inathermodynamicdescriptionofamineralsolidsolution,itiscustomarytoselecta minimalgroupofend-membersthatconstitutesanindependentset,andyetinpractical calculationsitcommonlyoccursthatadifferentindepen...
WeusedtheJUMBOmonochromatoratSSRLtomeasuretheAl K-edgeX-rayab- sorptionspectraofsyntheticmicashavingvariableAlcontentandoccupancy,from0to 2 intheoctahedralMpositions,and0to inthetetrahedralTposition...
Cation exchange experiments were carried out on phlogopite, biotite, and muscovite using cryptand [222] as a complexing agent, dioxane as solvent, and Li as the exchanging cation. The results indicate...
Two orientations of white micas with subordinate chlorite have been observed in a fine-grained (50 Å to 2 µm) matrix of a Silurian lower anchizonal mudrock from central Wales: one parallel...
The highest frequency near-infrared (NIR) combination bands for specimens of four species of mica—montmorillonite-beidellite, illite, chlorite, and kaolinite—were correlated with respect to Al2O3 cont...
Abstract: Investigation of a naturally occurring mixture of dioctahedral micas prompted an examination of X-ray diffraction (XRD) techniques for obtaining quantitative estimates of 1M and 2M1 mica pro...
To identify the far-infrared (FIR) absorption bands related to K cations in micas, spectra of muscovite, phlogopite, and biotite were compared with the spectra of pyrophyllite and talc, which have no ...
The characterization of cations associated with clay materials has generally been approached by the sequential use of specific chemical reagents. To avoid the disturbing effect of the chemical reagent...
Abstract: Classification and identification criteria of maximum-degree-of-order (MDO) polytypes of homo- and meso-octahedral micas based on the distribution of the intensities of 20l (13l) and 02l ref...
The maximum-degree-of-order (MDO) polytypes in all three mica families have been classified into two subfamilies and five homomorphous MDO groups according to their superposition structure and the YZ ...
A procedure leading to the systematic derivation of all maximum-degree-of-order (MDO) polytypes in the three mica families, based on the order-disorder (OD) interpretation of mica structures, has been...
Long-range ordering of tetrahedral cations in micas is favored by phengitic compositions, by the 3T stacking sequence of layers, and by tetrahedral Si:Al ratios near 1:1. Phengites of the 1M, 2M1, and...
The orientation of the OH-vectors in hydroxyl groups of micas of different compositions, polytype modifications, and symmetry were calculated by the method of minimization of electrostatic energy. The...

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