Scanning electron micrograph of amorphous silica spheres closest packed in an Australian fire opal showing red interference colors. Sphere size is ~2500 Ångstoms. Photo courtesy of Hans-Ude Nissen. Cover of Reviews in Mineralogy vol. 29 “Silica”

Scanning electron micrograph of amorphous silica spheres closest packed in an Australian fire opal showing red interference colors. Sphere size is ~2500 Ångstoms. Photo courtesy of Hans-Ude Nissen. Cover of Reviews in Mineralogy vol. 29 “Silica”

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