One of the mysteries of the English language finally explained.
Any of a number of forms of a crystalline substance which differ only in one of the dimensions of the unit cell.
- ‘Microcrystals of the following polytypes were identified: 4H, 6H, 15R, and 18R.’
- ‘There are four polytypes known.’
- ‘Several polytypes of wurtzite were reported at the Negley and Alikanna sites.’
- ‘The high-temperature polytype dickite is also present in the immediate vicinity of the thrust planes.’
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