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The Determination of 2V in Sections Perpendicular to an Optic Axis
T. C. Phemister
The Journal of Geology
Vol. 32, No. 5 (Jul. - Aug., 1924), pp. 400-406
Published by: The University of Chicago Press
Stable URL: http://www.jstor.org/stable/30058498
Page Count: 7
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A method is put forward whereby the optic angle of a crystal may be found in a section perpendicular to an optic axis. Curves of darkness for two series of spheroconics are drawn and the medial lines are plotted. The axis of the isogyre in a crystal section is referred to these curves whereby the value of 2V may be obtained to within approximately four degrees.
The Journal of Geology © 1924 The University of Chicago Press