Abstract
Natural amethyst of good optical quality is found to be remarkably similar to “wet” synthetic quartz in having a low flow stress at elevated temperatures and in being strengthened by prolonged heating at atmospheric pressure. The low temperature infrared spectra of the crystals also have in common a substantial broad hydroxyl absorption in the region of 340 mm −1 wavenumber. The low strength appears to be correlated with this “gel-type” hydroxyl absorption and not with ice bands from molecular water or with very sharp hydroxyl bands from structurally-bound hydroxyl.
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