Spectroscopic Study of Amethyst Quartz in the Ultraviolet and Infrared Regions

In this paper a study is made of the Absorption of light in the ultraviolet and infrared regions in amethyst quartz. In the ultraviolet the presence of the T-band is masked by the presence of iron impurity and it is difficult to assert its presence. That such a P-band exists was shown by Choong. In the near infrared three absorption bands arc observed the one on the long wavelength side ran be identified with the M-band and the others as bands due to impurity. MI these facts lead to the conclusion that the factors responsible for colour in the case of coloured alkali halides are also responsible for the coloration of amethyst quartz, with some slight difference