Science: Why are emeralds green
Emeralds are the green gem variety of the mineral beryl (Be3Al2(SiO3)6) and they are identical to other types of beryl except for their chromium and (sometimes) vanadium content: it is the chromium that gives emeralds their bright green color. The toughness (resistance to breaking) of emeralds is classified as generally poor: the Beryl has a hardness of […]
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