Opalised fossil

Opalised fossil

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Opalised fossil. Cut and polished surface of fossilised wood where gaps in the rock have been filled with opal. Opal is a form of hydrous silicon oxide deposited from silica-bearing waters in voids and fissures of certain rock formations. Water molecules trapped in the silica account for the milky luster and brilliant pastel colours that make opal such a desirable precious stone.

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Keywords: botanical, botany, chemical, chemistry, crystal, crystalline, crystallised, crystals, cut, earth science, filled, fissure, fissures, fossil, fossilised, gap, gaps, geographical, geography, geological, geology, historical, history, hydrated, hydrous silicon oxide, mineral, mineralogy, minerals, nature, opal, opalised, petrified, plant, plants, polished, prehistoric, prehistory, sample, silica, silica-bearing, silicon dioxide, specimen, still life, still-life, surface, void, voids, wood

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