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Topaz Topaz

Hardness: 8
Colour: Colourless, yellow, orange, pink and blue
Streak: White
Lustre: Vitreous
Other characteristics: Crystals can reach huge sizes - sometimes several hundred thousand kilograms!

Gemstone quality: Topaz has been used for centuries in jewellery and it can be a valuable gemstone.
Industrial uses: Not used much in industry.

Return to Mohs scale to learn more about hardness.