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Citrine
Citrine is the clear yellow or golden form of the mineral quartz. As such it is related to amethyst which is the purple form of quartz, and also to rock crystal which is the colourless variety.

Hardness
The hardness of citrine is 7, and appears on the Moh scale as quartz.

Misnomers
Citrine is often incorrectly and ignorantly sold as topaz. Although topaz and citrine can often be similar colours, they are both completely distinct gemstones. Often the owners and wearers of citrines ring call them topaz, presumably along the lines of wishful thinking. Many topaz are a richer colour than citrine,containing more orange colouration.

Technical Details
Chemical Composition and NameSiO2 - Silicon Dioxide
Hardness7
Refractive Index1.544 - 1.553
Bi-refringence0.009
Specific Gravity2.65 - 2.66
Crystalline SystemTrigonal (Rhombohedral)
Optic SignPositive
Other Optical PropertiesUniaxial


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