AM_Nierite_1 Formula: Si3 N4 Name: Nierite Unit cell: 7.765 7.765 5.6275 90.0 90.0 120.0 , V=293.85 Space group: P31C (159)

Yang P , Fun H-K , Rahman I A , Saleh M I , Ceramics International , 21 (1995) p.137-142, Two phase refinements of the structures of a-Si3N4 and B-Si3N4 made from rice, husk by Rietveld analysis, Locality: synthetic, Sample: Alpha phase, Note: changed N4 location to match reported bond distances