Without much formalities the results for the Search/Match Round Robin:

Sample 1 Minerals:

3-747 Hydroxylapatite
77-1060 Quartz
83-1764 Siderite (FeCO3)
80-1296 Na2Ca6(Si2O7)(SiO4)

83-1764 Siderite is not 100% certain. Peak positions are spot-on but intensities 
are a bit out. It could well be an isomorphous Co, Ni or Mn carbonate. A rietveld 
refinement should tell even without the chemical information. (Haven't got the 
time at the moment!)

80-1296 Na-Ca silicate would explain the most prominent residual peak at 13.344 deg.

Sample 2

Best fit for 48-475 Silicon Oxide Quinulidine Fluoride

Sample 3

Well this is anyone guess! Lot's of possible solutions. I don't want to submit 
anything without background information.

Sample 4

35-1482 PbO Litharge
23-333 Pb5O4SO4
29-781 Pb4O3SO4 * H2O

PbO and Pb5O4SO4 are easy to spot. Pb4O3SO4 * H2O is a bit more difficult 
to find. It is really tempting to dig deep into the noise and look for more 
lead sulfate or lead oxide sulfate but I rather restrain myself.

Samples 1 and 4 are done with Bede Search/Match, sample 2 the old fashion 
style Hanawalt search for 3 strong peaks. I used ICCD release 2001.

I hope all this makes some sense. I will do sample 3 once I've got the 
background information. Screenshots and some info on our Search/Match program 
to follow.