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MM22_569.pdf
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A chemical, optical, and X-ray study of nepheline and kaliophilite was conducted. The study found that the number of oxygen atoms in the unit cells of several nepheline and elaeolite specimens is approximately constant. The cell-volumes and optical properties were correlated with the chemical composition, and an approximate structure was suggested to explain the variable composition of nepheline. The contents of the unit cell may be written Si16-n Aln(Na,K) with n ranging from 6.6 to 8.2. Kaliophilite was found to have a larger cell than nepheline, and its Lauegram exhibits higher symmetry. 'Pseudonepheline' has a slightly greater cell-volume than normal nepheline but its Lauegram is almost identical. Nine nepheline specimens were studied, including two elaeolite specimens, and the results of chemical analyses and physical measurements are presented.

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A chemical, optical, and X-ray study of nepheline and kaliophilite was conducted.

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  • File Format: PDF
  • File Size: 4.92 MB
  • Pages: 42
  • Language: EN
  • Total Downloads: 24
  • Last Updated: 2 months ago

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