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Natural and experimental conditions of formation of coarse-grained precious opal; nucleation and number of centers of supramolecular crystallization
D. V. Kalinin, V. V. Serdobintseva and Ya. V. Kuznetsova
Natural and experimental conditions of formation of coarse-grained precious opal; nucleation and number of centers of supramolecular crystallization
Russian Geology and Geophysics (2004) 45 (5): 559-564
Natural and experimental conditions of formation of coarse-grained precious opal; nucleation and number of centers of supramolecular crystallization
Russian Geology and Geophysics (2004) 45 (5): 559-564
Index Terms/Descriptors
Abstract
Natural coarse-grained precious opal structures result from the concentration of suspensions of monodisperse silica spheres and their subsequent supramolecular crystallization at low pH values. These processes occur in different media and at different times. Nucleation is determined by the diffusion of structural units at the interface, their large volume, and the insignificant incorporation of the system into the metastable zone. On synthesis of precious opal, the rate of supramolecular crystallization is determined by sedimentation of structural units, and the frequency of crystal seeding depends mainly on the viscosity of the dispersed medium.
ISSN: 1068-7971
Coden: SGGEDF
Serial Title: Russian Geology and Geophysics
Serial Volume: 45
Serial Issue: 5
Title: Natural and experimental conditions of formation of coarse-grained precious opal; nucleation and number of centers of supramolecular crystallization
Affiliation: Russian Academy of Sciences, Siberian Branch, United Institute of Geology, Geophysics and Mineralogy,
Novosibirsk,
Russian Federation
Pages: 559-564
Published: 2004
Text Language: English
Publisher: Allerton Press,
New York, NY,
United States
References: 16
Accession Number: 2007-086804
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 2 tables
Source Medium: WWW
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200739