Postage stamp collecting

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Mineral Stamps
Extensive collection of stamps featuring minerals, crystals and fossils from around the world.

Petroleum: The Black Gold
Petroleum petrol oil stamps

Thematic Philately Earth Sciences
A section of the Academy for Mineralogy website. You can order gems and mineral stamps, find links to other websites with a mineral theme or join a collectors study group.

Diamonds on Stamps
Site in Dutch about diamond gem stamps, classified by country

Shrader, Scott - Big Bear's Minerals and Gems on Stamps
A collector's online gallery of gems and mineral stamps

Busch, Richard - Philatelic Minerology
Gems and mineral stamps, classified by country or mineral name

Rock and Fossil Stamps of the United States
A gallery of stamps from the US with rocks, gems and mineral stamps, and prehistoric animals