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Mohs Hardness: 8
Specific Gravity: 3.53-3.56
Reflective Index: 1.610-1.620
The name topaz is most likely derived form the old Sanskrit word
topaz (fire). There is a common misconception that all topaz is
yellow. Pure topaz is colorless, but this well-loved gem occurs
in a broad range of colors: yellow, brown, pink, red, blue, and
green.
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