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Tridymite-cristobalite relations and stable solid solutions

Della M. Roy and Rustum Roy
Tridymite-cristobalite relations and stable solid solutions
American Mineralogist (1964) 49: 952-962


Experiments in sealed platinum containers have been directed towards establishing the extent and stability of crystalline solutions in tridymite-M, tridymite-S, and cristobalite, and lend unexpected support to the validity of the 1470 degrees inversion in pure SiO (sub 2) . Fluxes not entering into crystalline solution in either tridymite or cristobalite cause tridymite to be formed below, and cristobalite above, 1470 degrees + or -30 degrees C. Those forming crystalline solutions (Na+Al, Li+Al, and Ca+Al) cause a lowering of the inversion temperature. Similar experiments performed with quartz and tridymite suggest that the 870 degrees inversion should not be hastily abandoned as a reconstructive transformation in SiO (sub 2) . Studies included differential thermal analyses and X-ray diffraction analyses.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 49
Title: Tridymite-cristobalite relations and stable solid solutions
Pages: 952-962
Published: 1964
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
Accession Number: 1964-012903
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus., table
Source Note: nos. 7-8
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1964
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