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Definition of brazil law twin

A type of twin found in quartz in which the two crystalline individuals are of opposite kinds, one being right-handed, the other left-handed, twinned across the {1120} plane, with a face of the trigonal prism of the second order as twinning plane. Since one is not derivable from the other by any rotation, there is no twinning axis.

It is usually only possible to detect Brazil twinning under special polarized light.
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