A note on Becke's method for comparing the refractive indices of adjacent mineral grains in thin sections
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Abstract
This method, proposed by Becke in 1893, has become widely adopted. As is known, it is based on observing the movement of a bright strip that appears when using high-magnification objectives at the boundary between adjacent mineral grains, as the microscope tube is shifted, focusing alternately on on the upper (upper focus) and the lower surface (lower focus) of the thin section.
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(Archived) Articles
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References
- F. Becke — Über die Bestimmbarkeit der Gesteinsgemengtheile, besonders der Plagioklase auf Grund ihres Lichtbrechungsvermögens. Sitzungsberichte der mathematisch-naturwissenschaftlichen Classe der kaiserlichen Akademie der Wissenschaften in Wien, 102, Abteilung 1.
- Rosenbusch und Wülfing; Duparc et Pearce; Iddings; Weinschenk (in a somewhat modified form).
- E. S. Fedorov. Fundamentals of Petrography and Course in Crystallography.
- Luchitsky. Course in Petrography (figures after Weinschenk). (in Russian)