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Australian Boulder Opal is the second most expensive Opal, after Black Opal. It is found in ironstone boulders, the Opal forms inside their cracks and fissures.
Opal is a hydrated amorphous variety of silica that has a hardness of 5.5-6. It is also classed as mineraloid as it is unlike the crystalline variety of silica that is classed as a mineral.
According to legend, Opal is the symbol for innocence, purity and hope.