AM_Nierite Formula: Si2.925 N3.99 Name: Nierite Unit cell: 7.766 7.766 5.615 90.0 90.0 120.0 , V=293.28 Space group: P31C (159)

Kohatsu I , McCauley J W , Materials Research Bulletin , 9 (1974) p.917-920, Re-examination of the crystal structure of alpha-Si3N4, Locality: synthetic