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[en] Present article is devoted to fluorite of deposits of the Northern Tajikistan. The results of thermo geochemical studies of fluorite from barite deposits have been considered. The mineralogical characteristics of fluorite as well as distribution of impurities in its composition is given.
[en] Micro-Raman spectroscopy was used to evaluate the radiation damage in metamict form of gadolinite and defects formed in halite single crystals. The metamict mineral of gadolinite was investigated in order to study its structural variation in metamict form and recrystallized form. However, types of defects which are originally present in halite crystals responsible for its gradual colour variation are identified using Micro-Raman spectra (author)
[en] On the bases of studying of crystal-morphology fluorite, gas-liquid inclusions and some trace element contents, the perspective estimation some of the fluorite deposits of Eastern Pamir is given
[en] SNL-9 (permitted by the State Engineer as C-2950) was drilled to provide geological data and hydrological testing of the Culebra Dolomite Member of the Permian Rustler Formation within a proposed re-entrant of the margin of halite dissolved from the upper part of the Salado near Livingston Ridge. SNL-9 is located in the southeast quarter of section 23, T22S, R30E, in eastern Eddy County, New Mexico. SNL-9 was drilled to a total depth of 845 ft below the ground surface. Below surface dune sand and the Berino soil, SNL-9 encountered, in order, the Mescalero caliche, Gatuna, Dewey Lake, Rustler, and uppermost Salado Formations. Two intervals were cored: (1) from the lower Forty-niner Member through the Magenta Dolomite and into the upper Tamarisk Member; and (2) from the lower Tamarisk Member through the Culebra Dolomite and Los Medanos Members and into the uppermost Salado Formation. Geophysical logs were acquired from the open hole to total depth, and the drillhole was successfully completed with a screened interval open across the Culebra.
[en] A scheme reflecting the relationship between fluorite, fluorite-like superstructures and solid solutions with intermetallides Ca8In3, Mg5Ga2 and relative compounds is proposed. It is shown that the structural mechanism of interstition of additional metal atoms to the ratio of components 2:1 in intermetallides is identical to that of interstition of F atoms, proposed for fluorite-like solid solutions MF2+x, based on substitution of M4F23 clusters for M4F26 ones