Opal gemstones
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Science Photo Library Photo Prints and Wall Art
Opal gemstones
Opal gemstones. This mineral is a form of hydrous silicon oxide (silica, SiO2). It is named after the Indian word for precious stone. After it has been cut and polished, it has an iridescent sheen. This is as a result of its composition of microspheroids of silicon oxide that refract light. This is enhanced by reflections from tiny conchoidal fractures (crazing) that occur on exposure to the air. Opal never occurs in a crystalline form, but as small veins, globules and crusts. Several types occur: hazy blue, milky white, colourless and the highly prized red (fire opal) and black. Science Photo Library features Science and Medical images including photos and illustrations. © LAWRENCE LAWRY/SCIENCE PHOTO LIBRARY
Media ID 6365963
Assorted Earth Science Gem Stone Gem Stones Gems Mineral Natural Opal Opals Polished Precious Stones Stone
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