Opal
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)
Picture No
10703713
Media ID
47586233
Size
3884px x 4975px
(8.7MB)
Credit
Mary Evans / Natural History Museum
Source
Photograph from the Natural History Museum Collection
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Guatemala Hydrated Matrix Mineral Mineraloid Opal Opalescence Silica Slab Sulfate Sulphate
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