Mineral Stamps

If you collect stamps and have in your collection stamps featuring crystals, minerals, gems, jewels etc. that are not on this site, I would be very grateful if you could send me scans of them so that I can publish them. I will of course credit you and include a link to your site if you have one. I still have a number of stamps that I have yet to scan, so contact me (for instance in the comments below) before sending your scans. I need full color scans at 600 dpi, on a dark background. Unless the stamps are very old and rare, I only publish new stamps, not used stamps. I am also interested in the first day covers.

Thanks a lot in advance!