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Soâ¦how do beryl and chromium and vanadium get together to form emerald? How emeralds are formed. Plate tectonics shifts rock formations all over the place. Well, thatâs too much of an oversimplification, but it is the reason why ocean crust sometimes ends up scrunched together with continental rock. Part of the detailed explanation of plate tectonics.
Emeralds are green for the same reason as rubies are red. The ruby is a regular crystal of corundum containing chromium as an impurity. The emerald is a regular crystal of beryl that also contains chromium as an impurity. Beryl is the term given to beryllium aluminum silicate (Be2Al2Si6Ol8). In rubies an aluminum atom in the beryl lattice is replaced by a chromium atom.