Attached please find a report on the search / match round robin 2002. At the end of the first phase I submitted a brief report. I left out SMRR-3 and now I believe I made a mistake in SMRR-1. The mistake has, hopefully been sorted out, SMRR-3 is done as well. As you will see in the report, I have some problems with the formula mentioned in the chemical information as posted to the Reitveld and SDPD maillist. I look forward to recieving the correct answers, may be this will resolve the problem. I also attached the Bede Search/Match help file. Here you will find in-detail discussions of the algorithms used as well as screenshots. Thanks for organizing the search / match round robin All data were analysed with Bede Search / Match, release 4.53 and the ICDD Database, release 2001. In addition, searches for SMRR-2 were run using the three strongest peaks and an undocumented program written by myself. As a separate attachment I am sending the help files for Bede Search / Match. The file contains information on the algorithms used as well as a number of screen shots. SMRR-1 The mixture comprises: 3-747 Hydroxylapatite 77-1060 Quartz 83-1764 Siderite (FeCO3) 26-1381 Ca3Al6.5Si11.5O36 * 18H2O In my first report I mentioned the phase 80-1296 Na2Ca6(Si2O7)(SiO4). I think, I got this one wrong and I would like to replace it by 26-1381 (Ca3Al6.5Si11.5O36 * 18H2O) SMRR-2 A Hanawalt type search for the three strongest peaks within a given 2-theta window identifies 48-475 (Silicon Oxide Quinulidine Fluoride). There are a few weak peaks that cannot be explained by 48-475. However nothing meaningful can be identified from these peaks SMRR-3 Without any chemical information, I would have submitted: 45-1544 (6-Amino-phenalone) 19-1946 (Thalidomide) plus one unidentified phase. Chemical information sent out on 15 June suggests a chemical formula C13H10N2O4. A text search of ICDD release 2001 for C13H10N2O4 gives only one entry 2-201 (4-Nitrophenyl-N-phenylcarbamate). However I consider this unlikely to be the major phase: Overall the data quality is very good (max. intensity 85000, mean background ca. 4000 or 4%), data range 5 - 45°. 2-201 would require a 40% peak at 8.5° 2?. In this range no peak is showing up! There are 4 more entries with the related formula C13H10N2O4S: 14-896 2,4-dinitrophenyl-3-methylbenzylthioether 14-903 2,4-dinitrophenyl-4-methylbenzylthioether 14-933 2,4-dinitrophenyl-2-methylbenzylthioether 14-942 2,4-dinitrophenyl-phenylmethylthioether For the reasons mentioned above only 14-896 can be considered a likely candidate. However the formula is wrong! SMRR-4 The background information confirms the results already submitted 35-1482 PbO Litharge 23-333 Pb5O4SO4 29-781 Pb4O3SO4 * H2O PbO and Pb5O4SO4 are the major phases, Pb4O3SO4 * H2O being a minor phase. There is a fair chance that further mixed lead-oxo-sulfate phases hide in the background / noise, however I couldn't identify any further compounds.