Opal. The specimens at top right and middle right are polished

Wall Art and Photo Gifts from Science Photo Library

Opal. The specimens at top right and middle right are polished

Opal. The specimens at top right and middle right are polished and the specimens at left are in their natural state. Opal is a form of hydrous silicon oxide

Science Photo Library features Science and Medical images including photos and illustrations

Media ID 6328709

© PAUL BIDDLE/SCIENCE PHOTO LIBRARY

Bed Rock Gem Stone Geological Iridescent Mineral Mineralogy Natural Opal Polished Rock Silica Specimen Specimens Stone Unpolished

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