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At microscopic scales, precious opal is composed of silica spheres some 150–300 nm (5.9 × 10 −6 –1.18 × 10 −5 in) in diameter in a hexagonal or cubic close-packed lattice. It was shown by J. V. Sanders in the mid-1960s [ 8 ] [ 9 ] that these ordered silica spheres produce the internal colors by causing the interference and diffraction ...