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Opal gem with opal rockThe polished gem is from an unknown locality while the rough specimen of opal rock comes from Baracoo River, Queensland, Australia
Precious opal in ironside noduleOpals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass). Specimen found in Queensland, Australia. On display at the Natural History Museum, London
Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass). Specimen from Queensland, Australia
OpalA cut stone and crystal of opal. Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)
Opal
OpalPlay of colour in opal (opalescence). Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)
Precious opalA Cameo representing the dawn, on a limonitic matrix from Australia. Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)
OpalFire opal in a matrix slab of alunite from Guatemala. Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)
OpalBoulder or nodular opal in a sandstone matrix from Queensland, Australia. Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)
Labradorite carving
Opal doubletsOpals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)