acute bisectrix

acute bisectrix

[ə′kyüt ‚bī′sek·triks]
(mineralogy)
A bisecting line of the acute angle of the optic axes of biaxial minerals.
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The optical orientation, identical to that of olivine, is a = Z, b = X, and c = Y, which agrees with Payne's observation that the optic plane parallels the base and that the acute bisectrix is parallel to b.

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