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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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A Simple Procedure to Separate Natural from Synthetic Amethyst on the Basis of Twinning

Where there are no inclusions or colour zoning, the presence of Brazil twinning in the natural amethyst will usually make the distinction.

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