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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.
Lab 2. Igneous: Gems can occur in any type of rock. types of rock, igneous, sedimentary, and metamorphic. Each forms in a different way. fire). Gems formed in these rocks crystallize as the molten rock cools (in most cases). molten material is called magma below the surface and lava when it flows on the surface. The igneous rocks are primary and formed the crust as the earth cooled. formed today both above and below ground.