Gemstone Characteristics
Topaz

Chemical Composition:
Al2 (F,OH)2 SiO4
Hardness: 8
Refractive Index:
(Doubly Refractive) 1.61 - 1.62
Specific Gravity: 3.54
Lustre: Vitreous.
Locations Where Found:
Russia, Brazil, Siberia, Sri-Lanka.
Colours: Colourless, Blue, Yellow, Yellowish Brown, Pink.

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