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
Journal Article
·
· Am. Mineral.; (United States)
OSTI ID:5352130
The heat capacities, C/sub p//sup 0/ of low albite, analbite, microcline, and high sanidine have been measured between 350 and 1000 K by differential scanning calorimetry. Evaluation of the results of several phase equilibrium studies of the reaction quartz + jadeite = analbite yields -3029.870 +/- 4.200 and -2851.300 +/- 4.200 kJ/mol for the enthalpy and Gibbs free energy of formation, respectively, of jadeite at 298.15 K and 1 bar. The enthalpy of the low albite-analbite transition determined from calorimetry using Amelia albite for low albite underestimates the magnitude of the enthalpy of the transition because Amelia albite is partially disordered (e.g., Holm and Kleppa, 1968).
- Research Organization:
- Geological Survey, Reston, VA
- OSTI ID:
- 5352130
- Journal Information:
- Am. Mineral.; (United States), Vol. 66:11-12
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:5352130
Enthalpies of formation of low albite (NaAlSi/sub 3/O/sub 8/), gibbsite (Al(OH)/sub 3/), and NaAlO/sub 2/; revised values for. delta. H/sub f 298//sup 0/ and. delta. G/sub f 298//sup 0/ of some aluminosilicate minerals
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OSTI ID:5352130
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+3 more
Related Subjects
58 GEOSCIENCES
FELDSPARS
PHASE STUDIES
SPECIFIC HEAT
THERMODYNAMICS
ALBITE
CALORIMETRY
EXPERIMENTAL DATA
HIGH TEMPERATURE
VERY HIGH TEMPERATURE
DATA
INFORMATION
MINERALS
NUMERICAL DATA
PHYSICAL PROPERTIES
SILICATE MINERALS
THERMODYNAMIC PROPERTIES
580300* - Mineralogy
Petrology
& Rock Mechanics- (-1989)
FELDSPARS
PHASE STUDIES
SPECIFIC HEAT
THERMODYNAMICS
ALBITE
CALORIMETRY
EXPERIMENTAL DATA
HIGH TEMPERATURE
VERY HIGH TEMPERATURE
DATA
INFORMATION
MINERALS
NUMERICAL DATA
PHYSICAL PROPERTIES
SILICATE MINERALS
THERMODYNAMIC PROPERTIES
580300* - Mineralogy
Petrology
& Rock Mechanics- (-1989)