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Refinement of an Amesite-2H1 Polytype from Postmasburg, South Africa
Amesite-2H1 Distortions Ordering Patterns Postmasburg Refinement South Africa Twinning
2011/12/9
Abstract: The crystal structure of amesite-2H1 from the Postmasburg Mn ores of South Africa has been refined to R = 4.7% using Siemens P4 rotating-anode MoKα X-ray data and SHELXL-93 software. Partial...
Illite Polytype Quantification using WILDFIRE?Calculated X-Ray Diffraction Patterns
Cis-vacant Illite Polytypes Quantification Trans-vacant X-ray Diffraction
2011/12/27
Illite polytype quantification allows the differentiation of diagenetic and detrital illite components. In Paleozoic shales from the Illinois Basin, we observe 3 polytypes: 1Md, 1M and 2M1. 1Md and 1M...
Polytype Diversity of the Hydrotalcite-Like Minerals II. Determination of the Polytypes of Experimentally Studied Varieties
Hydrotalcite-like group Polytype X-ray diffraction criteria
2011/12/30
Polytype diversity of hydrotalcite-like minerals is mainly a function of the nature of the interlayer anion. Among the varieties with CO32− anions, only two- and three-layer polylypes having the...
Polytype Diversity of the Hydrotalcite-Like Minerals I. Possible Polytypes and their Diffraction Features
Hydrotalcite-like group Polytype X-ray diffraction criteria
2011/12/30
All possible polytypes of hydrotalcite-like minerals with a periodicity along the c axis of one-, two- and three-layers, as well as the simplest six-layer polytypes, were derived on the basis of the c...
Chlorite Polytype Geothermometry
Chlorite Diagenesis Geothermometry Low-grade metamorphism Polytypes
2011/12/29
Since the initial studies of chlorite polytypes, it has been suggested that the stability of the various polytypes may be a function of the temperature at which the mineral formed; however, few studie...
Resolution of the Polytype Structure of Some Illitic Clay Minerals that Appear to be 1Md
Ethylene glycol solvation Illite Illite/smectite Polytype Order-disorder X-ray powder diffraction
2012/1/5
Illite/smectite (I/S) and illite samples that appear to be 1Md polytypes on the basis of the lack of diagnostic reflections can be resolved as partly either 1M or 2M1 or both by either vapor solvation...