Reactions in the System CaO-MgO-SiO2-H2O. Hydrothermal Treatment of Some Compositions on the Joins Ca3Si2O7-Mg3Si2O7 and Ca2SiO4-Mg2SiO4

K. Speakman
The Building Research Station, Garston, Watford

Summary: The effects of hydrothermal treatments on gel mixtures and synthetic minerals in the C3S2-M3S2 and C2S-M2S regions of the CaO-MgO-SiO2 system have been investigated. The products formed in the temperature range 180-350°C at pressures up to 220 N/mm2 were identified. The reactants generally behaved as simple mixtures of binary silicates and their products agreed well with existing data for reactions in the CaO-SiO2-H2O and MgO-SiO2-H2O systems. An unidentified phase that resulted from the hydration of åkermanite could be a new compound in the quaternary CaO-MgO-SiO2-H2O system. There was no evidence to indicate that a magnesium analogue of kilchoanite can be formed from materials that are isostructural with γ-Ca2SiO4.

Mineralogical Magazine; March 1970 v. 37; no. 289; p. 578-587; DOI: 10.1180/minmag.1970.037.289.07
© 1970, The Mineralogical Society
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