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THE QUANTITATIVE MICROSCOPIC ANALYSIS OF COMMERCIAL FELDSPAR 1
Author(s) -
Insley Herbert
Publication year - 1927
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1927.tb18495.x
Subject(s) - feldspar , plagioclase , quartz , mineralogy , mineral , potash , fusion , ceramic , materials science , geology , metallurgy , potassium , linguistics , philosophy
This investigation was undertaken to develop microscopic methods for determining quantitatively the mineral constituents in feldspars used in the ceramic and allied industries. After several methods had been tried, a method of counting the grains and of using liquids of different indices of refraction for distinguishing the constituents was finally adopted. Nineteen commercial feldspars were analyzed by this method and the results compared with the results obtained by computing the chemical analyses to mineral constituents. Another method in which a partially fused sample was examined microscopically was also found suitable. It is concluded that, while neither the counting method nor the fusion method is as accurate as chemical analysis, the counting method gives satisfactory results for plant control in terms of potash feldspar, plagioclase feldspar, and quartz when used by a skilled microscopist, and the fusion method gives satisfactory results in the hands of the plant technologist for estimating quartz.