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Hyalite, Queensland, Australia; 3 1/4" Across

Hyalite is a type of opal. It is amorphous silica. Since opal does not have any internal crystalline structure, it is classified as a mineraloid and not a mineral. To be a mineral species, a substance cannot be amorphous. This is an important Australian hyalite specimen.

Matthew Webb Photo
www.bluemelon.com/exclusiveminerals


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