Single crystal X-ray studies of crypto- and micro-perthites

Forelesninger holdt ved Advanced Study Institute of Feldspar - Oslo 1962
Lectures held at Advanced Study Institute of Feldspar - Oslo 1962

A study has been made of the single crystal X-ray diffraction patterns of about 150 micro- and crypto-perthitic feldspars from a variety of geological localities. These patterns are divided into five types, each type corresponding to a different stage of exsolution. The single crystal X-ray technique appears to have considerable petrological application in the study of a layered complex such as the Kûngnât syenites (Upton (1960)) in which significant differences are found in the X-ray diffraction patterns of crystals from different units of the complex.