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Excerpt from The Chemistry of the Arts; Being a Practical Display of the Arts and Manufactures Which Depend on Chemical Principles, Vol. 2: On the Basis of Gray's Operative Chemist, Adapted to the United States; With Treatises on Calico Printing, Bleaching, and Other Large Additions
Bacquet made a chemical distinction between rock crystal and quartz; the latter, cracking by heat, probably on account of containing water.
The amethyst by a moderate heat becomes colourless; but if the heat is violent, white and shotten like an opal, it is more liable to crack in the fire than rock crystal.
Beryl is changed by a moderate heat to a light blue; if the heat is greater it becomes like mother of pearl.
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