16.5.3: Citrine

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Page ID: 4088

gemology
Gemology Project

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Citrine
Chemical composition	Silicon dioxide SiO₂
Crystal system	Trigonal
Habit	Prismatic
Cleavage	Poor
Fracture	Conchoidal
Hardness	7
Optic nature	Uniaxial +
Refractive index	1.544 - 1.553
Birefringence	0.009
Dispersion	Low, 0.013
Specific gravity	2.63 - 2.65
Lustre	Vitreous
Pleochroism	Weak to distinct

File:Citrine rough and cut.jpg

Figure \(\PageIndex{1}\): Citrine oval faceted on Madiera Citrine Crystals.
Photo courtesy of Barbra Voltaire

Citrine is a yellow or golden variety of quartz. Most citrine available today is heat-treated amethyst. When amethyst is heated to about 482.2 degrees Celsius, it alters to a golden tone. Citrine has been credited with curing urinary tract infections, jaundice and kidney ailments. This is obviously a color association.

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