Hawthorne, F.C. and Sokolova, E. (2008) The crystal chemistry of the scapolite-group minerals: II. The origin of the I4/m ↔ P42/n phase transition and the non-linear variations in chemical composition. Canadian Mineralogist 46, 1555-1575.
Sokolova, E. and Hawthorne, F.C. (2008) The crystal chemistry of the scapolite-group minerals: I. Crystal structure and long-range order. Canadian Mineralogist 46, 1527-1554.
Teertstra, D.K., Schindler, M., Sherriff, B.L. and Hawthorne, F.C. (1999) Silvialite, a new sulfate-dominant member of the scapolite group with an Al-Si composition near the I4/m - P42/n phase transition. Mineralogical Magazine 63, 321-329.