Presented below are links to some other web sites which feature gem, rock, and mineral postage stamps.
Hans Marquardt Mineralogie - Paläontologie - Geologie und Bergabaumotive auf Briefmarken
Mineral stamps (updated 2009)
Stéphane Gigandet A collection of stamps figuring photos or images of minerals, cristals, gems, rocks, fossils and meteorites from around the world.
Philathelic Mineralgy (updated 2010)
Richard Busch Gem, Rock, and Mineral Postage Stamps
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