The equilibrium constants for endmember feldspar hydrolysis for the following reactions NaAlSi 3 O 8 8H 2 O Na Al(OH) 4 3H 4 SiO 4 0 KAlSi 3 O 8 8H 2 O K Al(OH) 4 3H 4 SiO 4 0 CaAl 2 Si 2 O 8 8H 2 O Ca 2 2Al(OH) 4 2H 4 SiO 4 0 are accurately described by log K low-albite 96.267305,542/T 2 3985.50/T28.588 10 6 T 2 35.790 log T log K high-albite 97.275306,065/T 2 3313.51/T28.622 10 6 T 2 35.851 log T log K microcline 78.594311,970/T 2 6068.38/T27.776 10 6 T 2 30.308 log T log K sanidine 77.837316,431/T 2 5719.10/T27.712 10 6 T 2 29.738 log T log K anorthite 88.591326,546/T 2 2720.61/T40.100 10 6 T 2 31.168 log T
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Stefán Arnórsson (1999) studied this question.
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