Abstract
EARLIER work on the structure of opal1 has shown that precious opal, and probably most ‘amorphous’ opals with the notable exception of hyalites, are composed of silica spheres 1500–3000 Å in diameter. It was further suggested that the presence of these spheres may reflect a genetic difference from the majority of crystalline opals, which have a different gross structure.
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JONES, J., BIDDLE, J. & SEGNIT, E. Opal Genesis. Nature 210, 1353–1354 (1966). https://doi.org/10.1038/2101353a0
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DOI: https://doi.org/10.1038/2101353a0
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