Abstract

The temperature stability of natural phillipsite (locality Libochovany, Bohemia) was studied in the temperature range 20–1000 °C both in a dynamic regime in air (d.t.a., t.g.a.) and in an isothermal regime in vacuo. The products of decomposition were investigated by the X-ray powder method and infrared absorption spectroscopy. The scheme of the decomposition of phillipsite may be writen as follows: phillipsite →200°C wairakite + SiO2→500°Cmeta-wairakite (cubic) + SiO2→790°C anorthite + SiO2. Over the temperature of 300 °C, the remaining water forms the structural hydroxyl groups, which persist up to the highest temperatures

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