The Commission on New Minerals and Mineral Names (CNMMN) of the International Mineralogical Association has published guidelines on a number of matters dealing with mineralogical nomenclature, including polytype nomenclature (e.g., Nickel and Mandarino, 1987). In essence, polytypes are distinguished by alphanumeric symbols appended to the root name and joined to it by a hyphen. The numeric part of the symbol represents the layering periodicity, and the alphabetic part, rendered in italic print, represents the crystallographic system. For example, wurtzite-4H is a hexagonal wurtzite polytype with a periodicity of four times the c dimension of the wurtzite parent.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.