Contents Page Introduction 1 Standardx-raypowderpatterns: Aluminum3:2Silicate(mullite),3Al203-2Si02 (orthorhombic) 3 AmmoniumFluoberyllate,(NH4)2BeF4(ortho- rhombic) 5 AmmoniumFluoborate,NH4BF4(orthorhombic). 6 *AntimonySelenide,Sb2Se3(orthorhombic) 7 *AntimonyTelluride,Sb2Te3(trigonal) 8 *ArsenicTrioxide,claudetite,AS2O3(mono- clinic) 9 *BariumBromideMonohydrate,BaBr2-H20