The Diffraction Rings Indexed according to JCPDS, card No∶ 21–1272.Wenbing LiTingying ZengJCPDS-ICDD Powder Diffraction file (1990) Card No 22-1040.International Committee for Diffraction Data: Card No. 01-085-1326
System: monoclinic Space Group: P21/m (no. 11)a: 9.1279 b: 3.8032 ...