Optical absorption measurements on natural and synthetic ferromagnesian minerals subjected to high pressures

Physics

Scientific paper

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Scientific paper

The ultra-violet and visible absorption spectra of various ferromagnesian minerals are studied under changes of pressure and temperature. The technique of absorption measurement at atmospheric temperature and pressures up to 5.104 bars is described. An interpretation of irreversible changes in absorption after heating specimens in air is given. Differences in the behaviour of the ultra-violet absorption of the various minerals under pressure is interpreted as the effect of ferrous and ferric iron in sites of differing crystal field intensity. At present at the Physics Department, University of Toronto, Canada.

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