Software used: PHILIPS Analytical X'Pert HighScore v.1.0b, with ICDD PDF-2 database release 2001. PHILIPS Analytical X'Pert Plus v.1.0 for crystallographic analysis (sample2) ==================================================== Sample 1: solved(?), pegmatitic minerals The main phase is: Fluorapatite, Ca5(PO4)3F or Hydroxylapatite, Ca5(PO4)3OH. Other phases involved are: Quartz, SiO2; Zircon, ZrSiO4; Girvasite, NaCa2Mg3(PO4)2[(PO2)(OH)]2CO3(OH)2*4(H2O) and Amarillite, NaFe(SO4)2*6(H2O). This is a difficult sample. Possible a mixed carbonate phase (Ca-Mg-Fe-carbonate) is also involved. ==================================================== Sample2: solved This is a monophase material. Unit cell search (TREOR) and subsequent refinement revealed a tetragonal cell with a=9.082 and c=13.458 [Angstrom] and a zero offset of -0.01 [deg. 2Theta]. The closest match in the ICDD PDF-2 is no. 26-1993, b-Uranium bis(tetraethylammonium) fluoride, C8H20F6NU. Peak positions match rather good, but the intensities are very different. The "true" phase is not in the ICDD PDF-2 database. ==================================================== Sample 3: not solved, waiting for additional info. There seems no simple solution to be present in the database. Some active substances fit partially, e.g. Gemfibrozil or Antabuse. The quality of the available reference data could be part of the difficulties presented here. ==================================================== Sample4: completely solved (phases from a car battery) The phases are: Massicot, PbO; Litharge, PbO; lead oxide sulfate, Pb5O4SO4 and lead oxide sulfate hydrate, Pb4O3SO4*H2O. ====================================================