1. W. A. Deer, R. A. Howie, and J. Zussman, ?Rockforming Minerals?, Vol. 2, Chain Silicates (Longmans, Green & Co, London, 1962).
2. A. A. Hodgson, ?Fibrous Silicates? (Royal Institute of Chemistry, London, 1965).
3. M. S. Badollet, Trans. Canad. Inst. Min. Metall. 54 (1951) 151.
4. D. King, Trans. Roy. Soc. S. Aust. 84 (1961) 119.
5. E. J. W. Whittaker and J. Zussman, Acta Cryst. 14 (1961) 54.