In three dimensions, these hexagons are made up of one silicon atom and four oxygen atoms

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In three dimensions, these hexagons are composed of many interlocking pyramids made up of one silicon atom and four oxygen atoms.So the signature shape of a quartz crystal is a six-sided column with pointed tips. Depending on environmental conditions,most crystals have the potential to form multiple geometric shapes. For example, diamonds, which form deep in the Earth’s mantle, have a cubic crystalline structure and can grow into either cubes or octahedrons.

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