A list of ZnS polytypes having thirty or more layers in their elementary stacking sequences is presented, including seven new polytypes: 90R (18 2 7 3)3; 90R (8 3 5 5 3 6)3; 96R (17 4 6 5)3; 102R (31 3)3; 34L (7 5 3 5 5 5 2 2); 120R (29 3 2 2 2 2)3 and 120R (13 3 3 5 11 5)3. Polytype identification procedures are discussed from the point of view of reliability. It is demonstrated that even for such polytypes unambiguous identification is possible without exact intensity measurements. For these polytypes, the Burgers vector of the generating [00.1] screw dislocation has a length of 90/~ or more.
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Kiflawi et al. (1972) studied this question.