On a Question Relative to Extinction-Angles in Rock-slices1

Alfred Harker
1Compare “ Extinction-Angles in Cleavage-Flakes” By Alfred Harker. Min. Mag. 1893, Vol. X, p. 239.

Mineralogical Magazine; May 1901 v. 13; no. 59; p. 66-68; DOI: 10.1180/minmag.1901.013.59.06
© 1901, The Mineralogical Society
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