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The 3543 CM-1 Infrared Absorption Band in Natural and Synthetic Amethyst and its Value in Identification

The proper use and limitations of IR spectroscopy for identifying natural versus synthetic amethyst of various types have been investigated, focusing on the region 3800–3000 cm-1.

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Artificially Induced Colour in Amethyst-Citrine Quartz

A new and rather unusual gem material and possible treatments are discussed.

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