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