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See Alexandrite Tsarstone collectors guide, Definition of Quench crackled synthetic corundum, 
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http://www.alexandrite.net/viewpage.html?id=GG-102-00003
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 (An unusual feature occur in Verneuil synthetic corundum by plunging of still heated stone into a much cooler liquid (thermal shock), which create fractures and it resemble closely to natural stone. By pursuing of this process developed honeycomb pattern due to creating fractures. Also called quench cracking.) (as of ).
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 of 
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Quench crackled synthetic corundum
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Quench crackled synthetic corundum
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An unusual feature occur in Verneuil synthetic corundum by plunging of still heated stone into a much cooler liquid (thermal shock), which create fractures and it resemble closely to natural stone. By pursuing of this process developed honeycomb pattern due to creating fractures. Also called quench cracking.
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