Quartz (rock crystal) mineral, crystal structure. Onyx, amethyst and agate gemstone are all varieties of quartz. Atoms shown as color-coded spheres (S

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Quartz (rock crystal) mineral, crystal structure. Onyx, amethyst and agate gemstone are all varieties of quartz. Atoms shown as color-coded spheres (Si, beige; O, red).

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Keywords: agate, amethyst, atomic, atoms, beta, cell, citrine, composition, crystal, gem, gemstone, jewel, lattice, mineral, molecular, molecule, onyx, oxygen, pink, quartz, rock, rose, silicium, silicon, sio2, solid, structure, tetrahedra, tetrahedral, unit