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Thermodynamics of the disordering process in albite

J. L. Holm and O. J. Kleppa
Thermodynamics of the disordering process in albite
American Mineralogist (October 1968) 53 (1-2): 123-133


The enthalpies of solution, in lead-cadmium-borate at 700 degrees C, of samples of Amelia albite heated for 0-35 days at 1045+ or -5 degrees C have been measured. For the transformation low to high albite at 700 degrees C, we obtained a change in enthalpy of 3.4+ or -0.25 kcal per mole. The enthalpy of solution data indicates that change from low to high albite takes place in two steps. The first step, complete after three days at 1045 degrees C, is associated with an enthalpy change of about 2.4 kcal per mole; the second step of about 1 kcal per mole was nearly complete after three weeks at 1045 degrees C. We attribute the first step in the transformation to partial disordering of Al+Si atoms to form an 'intermediate' albite. Calculated transformation temperatures are consistent with the work of McConnell and McKie, who suggested the existence of a 'smeared' polymorphic transformation around 600 degrees C.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 53
Serial Issue: 1-2
Title: Thermodynamics of the disordering process in albite
Pages: 123-133
Published: 196810
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
Accession Number: 1968-052766
Categories: Mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus., tables
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: 1968
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