AM_Spurrite_1 Formula: Ca5 Si2 C O11 Name: Spurrite Unit cell: 10.49 6.705 14.16 90.0 101.317 90.0 , V=976.59 Space group: P121/A1 (14)

Smith J V , Karle I L , Hauptman H , Karle J , Acta Crystallographica , 13 (1960) p.454-458, The crystal structure of spurrite, Ca5(SiO4)2CO3., II. Description of structure, Locality: contact zone at Scawt Hill, North Ireland