The calcium silicofluoride of tentative composition (3CaO. SiO2)3. CaF2 /
Gutt, Witold Henryk.
Osborne, G. J.
[Garston] :  Building Research Station, 
1968.
Reprinted from Transactions of the British Ceramic Society, 1968, vol. 67 (4), pp. 125-133.