Heat capacities of the alkali feldspars between 350 and 1000 K from differential scanning calorimetry, the thermodynamic functions of the alkali feldspars from 298.15 to 1400 K, and the reaction quartz + jadeite = analbite

The phase equilibrium studies yield -3029.870 + or - 4.200 for the enthalpy and -2851.300 4.200 kJ/mol for Gibbs free energy of formation of jadeite at 298.15 K and 1 bar. Amelia albite is partially disordered and therefore yields underestimates of the enthalpy of the transformation from low-albite...

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Bibliographic Details
Published in:The American mineralogist 1981-12, Vol.66 (11-12), p.1202-1215
Main Authors: Hemingway, Bruce S, Krupka, Kenneth M, Robie, Richard A
Format: Article
Language:English
Subjects:
albite
alkali feldspar
analbite
chain silicates
clinopyroxene
enthalpy
experimental studies
feldspar group
framework silicates
geochemistry
Geophysics
heat capacity
high temperature
jadeite
microcline
mineral data
mineral properties
minerals
P-T conditions
phase equilibria
plagioclase
properties
pyroxene group
quartz
sanidine
silica minerals
silicates
temperature
thermodynamic properties
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Summary:The phase equilibrium studies yield -3029.870 + or - 4.200 for the enthalpy and -2851.300 4.200 kJ/mol for Gibbs free energy of formation of jadeite at 298.15 K and 1 bar. Amelia albite is partially disordered and therefore yields underestimates of the enthalpy of the transformation from low-albite to analbite.
ISSN:0003-004X
1945-3027