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B., Segnit, E. R. (1971) The nature of opal I. nomenclature and constituent phases. \u003Ci>Journal of the Geological Society of Australia\u003C\u002Fi>,  18 (1) 57-68 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1080\u002F00167617108728743'>doi:10.1080\u002F00167617108728743\u003C\u002Fa>","10.1080\u002F00167617108728743",{"id":129,"year":130,"html":131,"doi":132},151484,1985,"Graetsch, H., Flörke, O. W., Miehe, G. (1985) The nature of water in chalcedony and opal-C from brazilian agate geodes. \u003Ci>Physics and Chemistry of Minerals\u003C\u002Fi>,  12 (5). 300-306 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1007\u002Fbf00310343'>doi:10.1007\u002Fbf00310343\u003C\u002Fa>","10.1007\u002Fbf00310343",{"id":134,"year":135,"html":136,"doi":8},16121337,1994,"Graetsch, H. (1994) Structural characteristics of opaline and microcrystalline silica minerals. in: Heaney, P.J., Gibbs, G.V., editors. Reviews in Mineralogy Volume 29 Silica - Physical behaviour, geochemistry and materials applications. Mineralogical Society of America, 209-232.",{"id":138,"year":135,"html":139,"doi":140},3235954,"Elzea, J.M., Odom, I.E., Miles, W.J. (1994) Distinguishing well ordered opal-CT and opal-C from high temperature cristobalite by x-ray diffraction. \u003Ci>Analytica Chimica Acta\u003C\u002Fi>, 286 (1). 107-116 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1016\u002F0003-2670(94)80182-7'>doi:10.1016\u002F0003-2670(94)80182-7\u003C\u002Fa>","10.1016\u002F0003-2670(94)80182-7",[142],{"id":143,"source_url":144,"license_code":145,"credit_html":146,"title":147,"description":148,"author":149,"original_width":150,"original_height":151},71596,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=36942864","Public domain","Raúl Jorge Tauber Larry, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=36942864\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Opal (Var. 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