Welcher Edelstein ist das?
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Drahokamy a krystaly včetně Krystalové soustavy a stupnice tvrdosti.
Kristallsystem und Härteschlüssel
Photos and information on form, color, origin, and other topics for many specific minerals, gems and crystals. Additional information on mineral formation in the earth.
Haltern-Flaesheim, Bode, 1985, 4to (cm. 28,5 x 22,5) legatura tutta tela con titoli dorati al dorso, sovraccoperta illustrata a colori, pp. 269 completamente illustrato da fotografie e tavole fotografiche in nero e a colori.