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All opals are hydrated amorphous forms of silica: SiO2.nH2O.

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Opals are actually not minerals, but are classed as mineraloids. This is because they lack a crystalline structure, yet are mineral in nature.


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Opals are a mined substance that can be found in fissures in rock. It is then processed, cleaned up and cut down to make different types of jewelry. This is how opal ware is made.


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Is opal a heterogeneous or homogeneous mixture?

Opal is a heterogeneous mixture because it is made up of different components, such as silica and water, that are not uniformly distributed throughout the material. This gives opal its unique play-of-color appearance.


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What is the difference between an Australian opal and an Ethiopian opal?

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What is the price of opal?

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