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Emerald is a gemstone in the beryl group (Beryllium aluminium silicate). Although emeralds can be colourless, when used as a gem it is usually coloured green because of small quantities of chromium (or sometimes vanadium). It has dihexagonal dipyramidal crystals. Emerald has a Mohs scale hardness of 7.5 to 8.
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Earn +20 ptsQ: What are the properties of an emerald?
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