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Crystals are solid substances that are naturally formed into regular geometric, angular shapes.

All crystals can be classified into seven systems. Sometimes a crystal is formed when water evaporates, and substances dissolved in the water gradually grow into a crystal. Other crystals are formed under great pressure.

Diamond crystals are made when carbon dissolves in molten rock deep down below the Earth's surface.

The diamond crystallizes out and is later uncovered on the surface eith read more...

Tags: diamond, earth

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