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Opals: characterization, nomenclature definition and proposal of a new varieties classification following the discovery of new materials in Peru
nomenclature definition new materials Peru varieties classification
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2011/11/8
This work has been carried out on a vast amount of samples (more than 500). In this summary I will concentrate on some of the analytical methods used on the characterization of 25 out of the Andean co...
Polytype Diversity of the Hydrotalcite-Like Minerals II. Determination of the Polytypes of Experimentally Studied Varieties
Hydrotalcite-like group Polytype X-ray diffraction criteria
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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...
X-Ray Identification of One-Layer Illite Varieties: Application to the Study of Illites around Uranium Deposits of Canada
Hydrothermal alteration Illite Octahedral cation distribution Polytype Uranium deposits Vacant cis-sites Vacant trans-sites
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2011/12/29
Structural and diffraction criteria for distinguishing between t-1M, c-1M, m-1M, and 3T illite varieties are described. The t-1M illite corresponds to a one-layer monoclinic structure with vacant tran...