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Item Description Uehara, Goro en_US Ikawa, Haruyoshi en_US Sherman, G.D. en_US 2009-04-09T23:03:12Z 2009-04-09T23:03:12Z 1966-01 en_US
dc.identifier.citation Uehara G, Ikawa H, Sherman GD. 1966. Desilication of halloysite and its relation to gibbsite formation. Pac Sci 20(1): 119-124. en_US
dc.identifier.issn 0030-8870 en_US
dc.description.abstract The evidence presented points to the alteration of halloysite to gibbsite. Mineralogical data, as determined by X-ray and differential analysis, verify identification of halloysite and gibbsite. Chemical data confirm the expected lower silica and higher alumina content for samples which are predominantly gibbsitic. It is reasonable to assume from petrographic evidence that gibbsite develops by desilicarion of halloysite. Halloysite amygdules undergo desilication along the outer peripheries, where acid silica-deficient waters pass, attacking the halloysite by dissolving silica. Halloysite is stable only if it is protected from such solutions, or if the solution passing by is saturated with silica. Whereas alteration of feldspar to halloysite involves a gain in volume, a loss in volume follows desilication of halloysite. This loss in volume is exemplified by the surface cracks clearly visible in the desilicated halloysite. en_US
dc.language.iso en-US en_US
dc.publisher University of Hawai'i Press en_US
dc.title Desilication of Halloysite and Its Relation to Gibbsite Formation en_US
dc.type Article en_US
dc.type.dcmi Text en_US

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