Webmineral.com
Over 4,400 mineral species are included in this database. Images, chemical structure, data are available.
Encyclozine.com
Colorful, hierarchal virtual encyclopedia. Contains photographs, graphs, links.
Symbols.com
Online encyclopedia of >2,500 symbols and ideograms. You can search by word, or graphic image.
World of Science
scienceworld.wolfram.com
Five detailed encyclopedias covering astronomy, biography, chemistry, mathematics, and physics. Entries include links, illustrations, animated gifs and interactive features.
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