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What is opal?

opal
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What is opal?

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Opal is an hydrated form of silica containing between 1-21% water. Precious opal has 6-10% water. Precious opal shows a play of colour caused by light diffraction. Common opal or ‘potch’ is generally clear to white. Opal has a hardness of 5.5 to 6.5 on Moh’s scale of hardness.

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