ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
Topaz. View of a sample of topaz a silicate mineral made of aluminium silicate. Topaz is a very hard stone, often transparent or translucent with a vitreous lustre. It is often colourless, but can be coloured, yellow, blue, pink, green, violet or reddish-yellow. Clear or finely coloured varieties have always been used as gemstones.
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