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Posted in response to Amethyst -> citrine heat process? from Tim Casey on December 31, 2010 at 10:25:30:

Re: Amethyst -> citrine heat process?

John Sinkankas, years back, suggested to me...bury the crystals into a bed of silicon carbide grains. Cool down slowly. Don't try to do an crystal larger than 1 1/4 or 1 1/2 inches in circumference, as it will probably crack, or craze...

From Raymond Hietapakka - January 02, 2011 at 22:17:10
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