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16.5.3: Citrine

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    4088
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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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