On the Determination of the Optic Axial Angle and Crystal-Forms from Observations by the Becke Method in Thin Sections

Harvey Collingridge

Mineralogical Magazine; September 1928 v. 21; no. 122; p. 552-555; DOI: 10.1180/minmag.1928.021.122.03
© 1928, The Mineralogical Society
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