gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1991.055.381.10 Mineralogy A New Method for Measuring the Crystallinity Index of Quartz by Infrared Spectroscopy Shoval S. Open University of Israel, 16 Klausner St., Tel-Aviv 61392, Israel Ginott Y. Nathan Y. Geological Survey of Israel, 30 Malkhei Israel St., Jerusalem 95501, Israel 12 1991 55 381 579 582 4 11 1990 18 12 1990 Copyright © 1991, The Mineralogical Society 1991 Abstract

A new method for measuring the crystallinity index of quartz is presented. It is based on the measurement of the intensity of the first derivative of the infrared absorption spectrum at the shoulder at c. 1145 cm−1. The results correlate well with X-ray and D.T.A. crystallinity measurements.

 Keywords quartz chert infrared spectroscopy crystallinity index IR first derivative