Most Citrine is formed by heat treating purple Amethyst. Citrine may also be produced
by heat-treating Smoky Quartz from certain localities. In some Amethyst deposits, the
Amethyst has been partially or fully changed over to yellow Citrine by natural means of heating.
Crystal system: Hexagonal
Chemical formula: SiO₂
Citrine is the transparent, pale yellow to brownish orange variety of quartz. Fashioned
citrines can be large.