510011733

Opal. Today this is valued as a semi-precious stone but this coloured opal was used in ancient Rome as a symbol of power. An Opal is not a single crystal but is made up of tiny spheres of silica. It also contains water and can dry out and crack, particularly if exposed to heat.

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Filename: 510011733.jpg
Copyright: Irish Photo Archive
Image Size: 3888x2592 / 3.2MB; rock geology
Contained in galleries: Recently uploaded historical photos 4

Opal. Today this is valued as a semi-precious stone but this coloured opal was used in ancient Rome as a symbol of power. An Opal is not a single crystal but is made up of tiny spheres of silica. It also contains water and can dry out and crack, particularly if exposed to heat.