|Chemical composition||Silicon dioxide SiO2|
|Optic nature||Uniaxial +|
|Refractive index||1.544 - 1.553|
|Specific gravity||2.63 - 2.65|
|Pleochroism||Weak to distinct|
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 to a golden tone. Citrine has been credited with curing urinary tract infections, jaundice and kidney ailments. This is obviously a color association.