Microscopical Physiography of the Rock Making Minerals An Aid to the Microscopi
Microscopical Physiography of the Rock Making Minerals An Aid to the Microscopi
Harry Rosenbusch
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= 8. Topaz is always perfectly transparent in thin section ; the index of refraction in consequence of its fluorine percentage is lower than is to be expected for a gem ; the double refraction is weak, about the same as that of quartz. Hence the relief is not strong, the interference colors quite low; in good thin sections they scarcely exceed yellow of the 1st order. On colorless Brazilian topaz Hud berg determined v. In thin sections the interference figure of both axes is obtained on t...hose sections which show no cleavage an important criterion for diagnosis.
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