Quench-Crackled Dyed Quartz Classification
Quench-Crackled Dyed Quartz
Quench Crackled Quartz
Various Colors Due To Dye But Most Commonly Green, Red
Refractive index, appearance, birefringence, optic character and optic figure. A bull's-eye optic figure is determinative for quartz; may also show Airy's spiral optic figure and Brazil-law twinning under crossed polarizing filters. Spectra might show presence of Chromium in dyes.
Stones are heated and then quenched in dye.