Spectroscopic study of amethyst quartz in the ultraviolet and infrared regions

Abstract

In this paper a study is made of the absorption of light in the ultravia!rt end infrared regions in amethyst quartz. In the ultraviolet the presence of the V-band is masked by the presence of iron impurity and it is difficult to assert its presence. That such a V-band exists was shown by Choong. In the near infrared three absorption bands are observed; the one oil the long wavelength side can be identified with the M-band and the others as bands due to impurity. hlI these facts lead to the conclusion that the factors respmsibie for colour in the case of coloured alkali halides are also responsible for the ccloration of amethye,t quartz, with some slight difference.