Slice through fossilised wood revealing opal

Slice through fossilised wood revealing opal

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Credit: VAUGHAN FLEMING/SCIENCE PHOTO LIBRARY

Caption: Opal. Slice through a mineralised tree trunk revealing opal, a form of hydrous silicon oxide. This is a blue form of the mineral. The tree's fibres have been replaced by mineral deposits so that its internal structure, such as the yearly growth rings, are still clearly visible. Opal is never found in crystalline form, but as small veins, globules and crusts. It is precipitated from silica-rich solutions.

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Keywords: fossil, hydrous silicon oxide, in mineralised wood, mineral, mineralised, mineralised wood, opal, silicon oxide, type, wood

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