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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

High-pressure phase transitions of kalsilite and related potassium bearing aluminosilicates

Lin-gun Liu
Geochemical Journal, Vol. 12, No. 4, P. 275-277, 1978


Phase behaviours of kalsilite and its related potassium bearing aluminosilicates (orthoclase and leucite) have been investigated in the pressure region between 120 and 300kbar and at about 1, 000°C in a diamond-anvil press coupled with laser heating. Kalsilite, similar to leucite, has been found to decompose into a mixture of the hollandite-type KAlSi3O8 plus a proposed high-pressure form of KAlO2. The transition was observed at loading pressures greater than 170kbar, and it may be accompanied by a 46% increase in the zero-pressure density. Results of this study show that the hollandite-type KAlSi3O8 is the only so-far-known potassium bearing silicate which is stable under the lower mantle conditions.

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