Color:
Yellow to orange with modifying brown

Clarity: Type I
Optic Character: DR Uniaxial Positive
Cause of Color: : Fe
Fluorescence: Inert
Fracture : Concoidal
Luster : Vitreous
Cleavage : None
Durability: Good

Characteristics for Identification:
Bulls-eye interference figure, color zoning, 2 and 3 phase inclusions, liquid inclusions, negative crystals

Localities:
Brazil is the main source

Citrine

SiO₂ (Silicon Dioxide)

Citrine is a yellow or golden variety of quartz. Most citrine available today is heat-treated amethyst. When amethyst is heated to about 900 degrees Fahrenheit, it alters to to a golden tone. Citrine has been credited with curing urinary tract infections, jaundice and kidney ailments. This is obviously a color association. I prefer the chakra based interpretation that views citrine as uplifting, bright, energizing and inspirational. It encourages the flow of Chi and activates intuition.

Citrine May be confused with:
Beryl
Labradorite
Scapolite
Orthoclase
Topaz
Amber

The Gemology Project: Citrine