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First Occurrence of a Stacking Sequence including (?0? 180? Rotations in Mg-Rich Annite
Annite Biotite HRTEM Mica Polytype-2O Polytypism Stacking Disorder
2011/12/8
Abstract: Transmission electron microscopy (TEM) observation shows narrow regions in a Ti-containing Mg-rich annite of composition (K0.90Na0.02)(Mg0.72Fe2+1.78Mn0.03Ti0.27Al0.05)(Si2.77Al1.23)O10(OH,F...
HRTEM and SAED investigations of polytypism, stacking disorder, crystal growth, and vacancies in chlorites from subgreenschist facies outcrops
Selected-area electron diffraction high-resolutio transmission electron microscopy
2012/3/30
Selected-areaelectrondiffraction(SAED)combinedwithexperimentalandcomputed
high-resolutiontransmissionelectronmicroscopy(HRTEM)imageswereusedtoinvesti-
gatepolytypism,stackingdisorder,mixedlayering,a...
Direct identification of the six polytypes of chlorite characterized by semi-random stacking
Direct identification chlorite characterized semi-random stacking
2012/3/31
This paper demonstrates that the six standard polytypes of chlorite, whose definitions are based on the orientation of the interlayer sheet and the position of the interlayer sheet on the 2:1 layer, c...
Stacking disorder and polytypism in enargite and luzonite
Stacking disorder polytypism enargite luzonite
2012/3/31
Microstructures of enargite and luzonite (Cu3AsS4) were studied using high-resolution transmission electron microscopy (HRTEM) and selected-area electron diffraction (SAED). Enargite and luzonite are ...
Tem and X-Ray Diffraction Evidence for Cristobalite and Tridymite Stacking Sequences in Opal
Opal Transmission Electron Microscopy X-Ray Diffraction
2011/12/27
Abstract: In an attempt to resolve the structure of opal-CT and opal-C more precisely, 24 opal samples from bentonites, Fuller's Earths, zeolite tufts, biogenic silicas and silicified kaolins have bee...
Interrelated Features of Structure and Stacking of Kaolin Mineral Layers
Dickite Halloysite Kaolinite Polytypism Stacking faults
2011/12/23
Abstract: Layer stackings in the ideal and real kaolinite structures are considered in terms of layer orientations i = 1, 2, ˇ 6, intra- and interlayer displacements of adjacent 0- and T-sheets, si an...
TEM Observations of Coherent Stacking Relations in Smectite, I/S and Illite of Shales: Evidence for MacEwan Crystallites and Dominance of 2M1 Polytypism
2M1 Polytypism Coherent Fundamental Particles Illite I/S MacEwan Crystallites Optical Diffraction Patterns SAED Smectite Stacking Relations Cross Fringes
2011/12/23
Abstract: TEM characterization of stacking relations in I/S of expanded shale samples from the Gulf Coast and Michigan Basin was carried out to address the issues of the degree of coherency and the na...
Ordering of the stacking sequence in cookeite with increasing pressure: An HRTEM study
Ordering stacking sequence cookeite increasing pressure HRTEM study
2012/4/5
To explore the effect of pressure on the stacking-sequence of the chlorite cookeite, a systematic TEM study ofstacking microstructures has been conducted onnatural samples from pegmatitic and metamorp...
Periodic and Nonperiodic Stacking in Biotite from the Bingham Canyon Porphyry Copper Deposit, Utah
5-Layer mica polytypes Biotite Transmission electron microscopy Structural oscillation
2011/12/27
Fine-grained biotite crystals within primary actinolite from a quartz monzonite body of the Bingham Canyon porphyry copper deposit, Utah, consist of 1M, 5M1, and 1Md polytype structures. HRTEM images ...
Stacking Order in a K/Mg Interstratified Vermiculite from Malawi
Crystal structure Interstratification Ion exchange Ordering Stacking Vermiculite
2011/12/30
The stacking order of a bi-ionic K/Mg vermiculite from Malawi (Nyasaland), has been determined from Weissenberg data. The sample corresponds to a K/Mg interstratified vermiculite containing 50% K laye...
Stacking Faults in Kaolin-Group Minerals in the Light of Real Structural Features
Defect structures Dickite Kaolinite Stacking faults X-ray powder diffraction
2012/1/5
A comparison of the structural characteristics of the kaolin-group minerals, mainly kaolinite and dickite, shows that they differ in both the two-dimensional periodicity in the 1:1 layers and the rota...
Stacking Faults in the Kaolin-Group Minerals: Defect Structures of Kaolinite
Crystallinity Defect structure Hinckley index Kaolinite Stacking faults X-ray powder diffraction
2012/1/5
Previous studies of the defect structure of kaolinite have examined samples having a restricted level of defects. This study examined nine kaolinite samples having a large diversity of defect contents...
Stacking Order in a 14.30-A Mg-Vermiculite
Crystal structure Ordering Polytype Stacking Vermiculite
2012/1/10
The stacking order of a 14.30-侌 Mg-vermiculite from Santa-Olalla, Spain, has been determined from Weissenberg photographs. The results prove that the Mg-vermiculite structure is not a 2-layer polytype...
Parameters Influencing Layer Stacking Types in Saponite and Vermiculite: A Review
Layer charge Layer stacking Relative humidity Saponite Vermiculite
2012/1/11
Saponites and vermiculites may assume at least 11 ordered or semi-ordered layer stacking sequences. For a given relative humidity, the layer stacking type assumed is a function of the nature of the in...
Molecular Motions, Surface Interactions, and Stacking Disorder in Kaolinite Intercalates
Dimethyl sulfoxide Electron paramagnetic resonance Formamide Infrared spectroscopy Intercalate Kaolinite N-methylformamide Nuclear magnetic resonance Specific heat
2012/1/13
Intercalates of Georgia well-crystallized kaolinite with formamide, N-methylformamide (NMF), and dimethylsulfoxide (DMSO) were prepared at room temperature by dispersing the clay in the organic liquid...