Abstract
AMONG those concerned with piezo-electric applications, it would appear that there is some confusion in the terminology for describing the interpenetrating twins which occur in α-quartz. For piezo-electric purposes, the highest quality Brazilian quartz is normally used, and there are three types of twinning of importance. These are: type 1, the rotational (Dauphiné) twin; type 2, the reflexion (Brazilian) twin; and type 3, a compound twin which can be regarded as a combination of types 1 and 2. Quartz technologists have their own terms for these twins; thus the first type is termed an 'electrical twin' the other two types are broadly spoken of as 'Optical twins', but their more exact descriptions are not well established.
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THOMAS, L. Terminology of Interpenetrating Twins in α-Quartz. Nature 155, 424 (1945). https://doi.org/10.1038/155424a0
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DOI: https://doi.org/10.1038/155424a0
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