Opal. Fire opal in a matrix slab of alunite from Guatemala
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Opal. Fire opal in a matrix slab of alunite from Guatemala
Fire opal in a matrix slab of alunite from Guatemala. Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)
Media ID 8585487
© Mary Evans / Natural History Museum
Abstract Guatemala Hydrated Matrix Mineral Mineraloid Opal Opalescence Silica Slab Sulfate Sulfate Mineral Sulphate
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