• 1 · Religion and Magic
• 2 · Nature
• 3 · Human Being, Man in General
• 4 · Society, Civilization, Culture
• 5 · Abstract Ideas and Concepts
• 6 · History
• 7 · Bible
• 8 · Literature
• 9 · Classical Mythology and Ancient History

• Top
• 2 · Nature
• 25 · earth, world as celestial body
• 25D · rock types; minerals and metals; soil types
• 25D1 · rock types
• 25D11 · precious and semiprecious stones
• 25D11(...) · precious and semiprecious stones (with NAME)

25D11(CHALCEDONY) · precious and semiprecious stones: chalcedony