and chromium. Emeralds are formed of a mineral called beryl whose chemical formula is a complex mix of beryllium, aluminum, silicon, and oxygen. The color comes from additional traces of chromium ...

Emerald is the green version of the mineral beryl that gets its color from an addition of chromium and/or vanadium. Beryllium ...

As corundum, beryl, and crysoberyl, these metal oxides are colourless and obscure minerals. But add a dash of chromium, and they become ruby, emerald and alexandrite. The chemist's tool of ...