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Minerals that form crystals in rock are sometimes rare and unusual. These are "jewels" or "gemstones."

The heat and pressure that form metamorphic rocks are also responsible for altering the minerals inside the rock often producing gemstones. For example, Coal is made from Carbon, if enough heat and pressure is applied to the Coal it will become a Diamond. The Diamond is still made from Carbon, but it's properties have changed because of the extreme conditions.

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16y ago

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