quartz rock crystal mineral structure onyx amethyst and agate gemstone are all varieties |
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| navigate by keyword : quartz beta silicon oxygen tetrahedra tetrahedral sio2 gem gemstone jewel rock crystal agate onyx citrine amethyst rose pink silicium structure atoms molecule molecular atomic composition cell unit solid lattice mineral |
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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, blue; O, red |
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