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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.
The short story is this: 1  Igneous; they form from the cooling of magma deep inside the earth. 2  They often have large crystals (you can see then with the naked eye). 3  Metamorphic; they are formed through the change (metamorphosis) of igneous and sedimentary rocks. 4  They can form both underground and at the surface.