Zoned Margarite from the Badshot Formation (Cambrian) near Kaslo, British Columbia

1971 ◽  
Vol 8 (9) ◽  
pp. 1145-1147 ◽  
Author(s):  
J. W. Jones
Keyword(s):  
British Columbia ◽  
Electron Microprobe ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Regional Metamorphism ◽  
Garnet Zone

Electron microprobe analysis of margarite crystals shows that they are zoned from Ca1.13Na0.74K0.05(Al4.01Ti0.02Fe0.13Mg0.05)[Si4.78Al3.12O20](OH)4 in their centers to Ca1.63Na0.26K2.005 (Al3.98Ti0.02Fe0.13Mg0.05)[Si4.10Al3.90O20](OH)4 at their margins. The crystals occur in the disequilibrium assemblage calcite – phengite (2M1) – margarite – quartz – kaolinite – epidote –apatite found in Badshot marble from the almandine garnet zone of regional metamorphism.

Particularites chimiques et mineralogiques de la serie meta-evaporitique du gisement de pyrite de Niccioleta, Toscane, Italie

1983 ◽  
Vol S7-XXV (3) ◽  
pp. 411-419 ◽  
Author(s):  
Roland Dechomets
Keyword(s):  
Chemical Composition ◽  
Electron Microprobe ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Regional Metamorphism ◽  
Mica Schist ◽  
Sheet Silicates ◽  
The Common ◽  
Main Factor

Abstract The chemical composition of the meta-evaporitic series of Niccioleta is similar (evaporitic rocks excepted) to that of the common mica schist series. However, the sheet silicates have recorded the evaporitic nature of the sedimentation. Only the schist layers in the anhydrite rocks have relatively high Mg and B contents. Electron microprobe analysis proved that muscovites are more phengitic and more magnesian in the evaporitic rocks than in the schists. Small amounts of Mg-bearing chlorites and phlogopites are associated with the phengites (which contain micro-inclusions of tourmaline, rich in dravite). The sedimentary origin of the magnesian character is discussed, the magnesian aggradations of illites are the main factor; typical minerals of evaporite-bearing sediments, like smectites and corrensites do not appear in large quantities. The P-T conditions of regional metamorphism are postulated as 2-3 kbar and 400-450 degrees C.

Scanning Electron Microscopy and Electron Microprobe Analysis of Malignant Cell Cultures

1968 ◽  
Vol 26 ◽  
pp. 164-165
Author(s):  
R. I. Johnsson-Hegyeli ◽  
A. F. Hegyeli ◽  
D. K. Landstrom ◽  
W. C. Lane
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cell Cultures ◽  
Electron Microprobe ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Three Dimensional ◽  
Malignant Cell ◽  
Interference Microscopy ◽  
Scanning Electron

Last year we reported on the use of reflected light interference microscopy (RLIM) for the direct color photography of the surfaces of living normal and malignant cell cultures without the use of replicas, fixatives, or stains. The surface topography of living cells was found to follow underlying cellular structures such as nuceloli, nuclear membranes, and cytoplasmic organelles, making possible the study of their three-dimensional relationships in time. The technique makes possible the direct examination of cells grown on opaque as well as transparent surfaces. The successful in situ electron microprobe analysis of the elemental composition and distribution within single tissue culture cells was also reported.This paper deals with the parallel and combined use of scanning electron microscopy (SEM) and the two previous techniques in a study of living and fixed cancer cells. All three studies can be carried out consecutively on the same experimental specimens without disturbing the cells or their structural relationships to each other and the surface on which they are grown. KB carcinoma cells were grown on glass coverslips in closed Leighto tubes as previously described. The cultures were photographed alive by means of RLIM, then fixed with a fixative modified from Sabatini, et al (1963).

Archaeometry of medieval Islamic glazed ceramics from North Yemen

1988 ◽  
Vol 66 (2) ◽  
pp. 266-272 ◽  
Author(s):  
Jessica R. Hallett ◽  
Michael Thompson ◽  
Edward J. Keall ◽  
Robert B. Mason
Keyword(s):  
Electron Microprobe ◽  
Microscopic Examination ◽  
Lead Oxide ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Annealing Temperatures ◽  
Safety Limit ◽  
Cobalt Blue

Microscopic examination and electron microprobe analysis were employed to determine the materials and techniques used to decorate ten glazed types of medieval Islamic ceramics from North Yemen. Eight types were underglaze-painted, one was slip-painted, and one was monochrome glazed. The glazes were of two compositions, soda–silica and lead oxide – silica with annealing temperatures of approximately 835 and 640 °C, respectively. The colourants used in the glazes and paints were cobalt (blue), iron (green), copper (green and blue), and antimony (yellow). Where clay slips or slip-paints were present, alumina enrichment of the glaze had occurred during application or firing, and pigment-paints on top of slip grounds masked enrichment. The Mellor ratio for the lead glazes ranges from 0.68 to 0.74 and is well above the acceptable safety limit of 0.5.

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