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Showing 1 to 1 of 1 for “"opal-t"”.
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The Twiggs Clay: mineralogy, origin, and industrial properties of an upper Eocene opaline claystone in the coastal plain province of Georgia, U.S.
… and the X-ray diffraction signature of the opaline phase is most like that of tridymite. The uppermost stratum is composed of kaolinite and smectite. This stratum lies above a prominent erosional surface and may represent a younger deposit. The opaline assemblage is an altered diatomite and …