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.
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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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
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