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Slawsonite (SrAl 2 Si 2 O 8 ) from Sarusaka, Kochi Prefecture, Japan, is triclinic, space group  P [unk], with  a  = 0.6145(1) nm,  b  = 0.8987(2) nm,  c  = 0.7456(3) nm,  α  = 90.01(3)°,  β  = 90.34(3)° and  γ  = 89.98(3)°,  Z  = 4 at  T  = 298 K. The cell dimensions are similar to the previous assignment to the monoclinic space group  P 2 1 / a . The average structure was refined to  R  = 0.049 from 2695 reflections. A model is proposed for the real structure taking into account about 200 superstructure reflections. Thermal analysis revealed a phase transition to  P 2 l / a  at 593 K which is considered a new type of transition for the paracelsian-slawsonite group.

A new modification of slawsonite, SrAl 2 Si 2 O 8 : Its structure and phase transition