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Amorphous Aluminum Hydroxide Formed at the Earliest Weathering Stages of K-Feldspar
Aluminum hydroxide Gibbsite Halloysite K-feldspar Weathering product
2011/12/27
Weathering products formed on the surface of K-feldspar in Yakushima Island, Japan were investigated by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron micros...
High temperature in situ structural investigation on lead feldspar
High-temperature increase
2012/3/30
Single-crystalX-raydiffractionwasperformedinsituat T 20,230,465,and700C
Si O , I2/c,a 8.402, b 13.043, c 14.308
onapartiallyorderedleadfeldspar(PbAl2 2 8351??
A, 115.30, V 1417.6A ; Q 0.71).Theunit...
Structural variations induced by thermal treatment in lead feldspar (PbAl2Si2O8)
Structural variations thermal treatment lead feldspar
2012/3/30
Lead feldspar single crystals were annealed at T 5 1050 and 1000 8 C, starting from a disordered metastable configuration (PbFH, Qod5 0) and from an ordered configura-tion (PbFL, Qod5 0.89). Single-cr...
Reversed determination of the reaction: Phlogopite + quartz = enstatite + potassium feldspar + H2O in the ranges 750-875 篊 and 2-12 kbar at low H2O activity with concentrated KCl soluctions
Reversed determination Phlogopite + quartz = enstatite + potassium feldspar + H2O H2O KCl soluctions
2012/3/31
The reaction of phlogopite plus quartz to enstatite, potassium feldspar, and aqueous fluid in the system KMASH-KCl was reversed at 2?2 kbar and 750?75 8C and at low H2O activities by reversal of the H...
TEM investigation of potassium-calcium feldspar inclusions in B鴊gild plagioclase
TEM investigation potassium-calcium feldspar inclusions B鴊gild plagioclase
2012/4/6
PotassiumcalciumfeldsparinclusionsinaBggildplagioclasewereinvestigatedbyanalyticalhighresolutiontransmissionelectronmicroscHRTEM),andtheformationprocessoftheseinclusionsisconsideredbasedontheAlSiorder...
Si-Al order and the I1 - I 2/c structural phase transition in synthetic CaAl2Si2O8- SrAl2Si2O8 feldspar: A 29Si MAS-NMR spectroscopic study
Si-Al order I1 - I 2/c structural phase transition synthetic CaAl2Si2O8- SrAl2Si2O8 feldspar A 29Si MAS-NMR spectroscopic study
2012/4/1
We present 29SiMAS-NMR spectroscopic data for a series of synthetic feldspar samples
along the join CaAI2Si20g-SrAI2Si20g, from which the composition dependence and cou-
pling of order parameters de...
Lattice simulation studies of the ferroelastic phase transitions in (Na,K)AlSi3O8 and (Sr,Ca)Al2Si2O8 feldspar solid solutions
Lattice simulation studies ferroelastic phase transitions (Na,K)AlSi3O8 (Sr,Ca)Al2Si2O8 feldspar solid solutions
2012/4/1
Lattice-energy minimization calculations have been performed on the feldspar systems
(Ca,Sr)AI2Si20g and disordered (Na,K)AlSi30g as functions of composition to simulate the
ferroelastic phase trans...
The structure of ordered and disordered lead feldspar (PbAl2Si2O8)
The structure lead feldspar (PbAl2Si2O8)
2012/4/9
The Al-Si configuration in ordered and disordered lead feldspar (PbA12Si20g) has been investigated by single-crystal X-ray diffraction, Single crystals synthesized from meltand cooled from T= 1280to 1...
Quantitative analysis of alkali feldspar minerals using Rietveld refinement of X-ray diffraction data
Quantitative analysis alkali feldspar minerals X-ray diffraction data
2012/4/6
Microcline +albite and albite + quartz standard mixtures werequantitatively analyzed using Rietveld refinement to investigate the reliability of the method. The method was also applied to the determin...
Formation of Mica During Experimental Alteration of K-Feldspar
Dissolution mechanism Experimental alteration Fibrous boehmite K-feldspar Mica
2011/12/28
Experimental alterations of K-feldspar in distilled-deionized water at 150°, 175°, 200°, and 225°C were performed. The alteration products and dissolution mechanism of K-feldspar were examined by X-ra...
Analytical Transmission Electron Microscope Studies of Plagioclase, Muscovite, and K-Feldspar Weathering
Analytical electron microscopy High-resolution transmission electron microscopy Illite Kaolinite K-feldspar Muscovite Noncrystalline intermediate Plagioclase
2011/11/30
Abstract: Analytical and high-resolution transmission electron microscopy of weathered plagioclase and K-feldspar provided microtextural and chemical data that suggest a sequential formation of weathe...
Diagenesis of Oligocene-Miocene Vitric Tuffs to Montmorillonite and K-Feldspar Deposits, Durango, Mexico
Clinoptilolite Diagenesis Energy-dispersive X-ray spectroscopy K-feldspar Montmorillonite Pyroclastic Scanning electron microscopy Tuff
2012/1/4
Montmorillonite and K-feldspar deposits of potential economic interest occur in the Late Oligocene-Miocene tuffs of the Vizcarra Formation in the state of Durango, Mexico. The two minerals were formed...
Feldspar Weathering in Lateritic Saprolite
Feldspar Gibbsite Halloysite Kaolinite Noncrystalline material Weathering
2011/11/25
Abstract: Feldspars in granitic saprolite in southwestern Australia have altered to halloysite, kaolinite, and gibbsite with no evidence of noncrystalline material. The secondary minerals are commonly...
High Resolution Electron Microscopy of Feldspar Weathering
Feldspar Illite/montmorillonite Ion thinning Microcline Transmission electron microscopy Weathering
2012/2/9
High resolution imaging by transmission electron microscopy has revealed a mechanism for the weathering of intermediate microcline in a humid, temperate climate. Dissolution of the feldspar begins at ...
Characterization of the Particle Size and the Crystallinity of Certain Minerals by IR Spectrophotometry and Other Instrumental Methods—II. Investigations on Quartz and Feldspar
Crystallinity Feldspar Grinding Orthoclase Quartz
2012/2/10
Infrared spectra of two minerals; Urkut quartz (Hungary) and a Swedish feldspar, of different origin with different physical characteristics and crystallinity were studied. Samples were taken after ap...