Representative origin: Brazil, Uruguay.

30.Agate Treasure Basin

Representative origin: Brazil.

31. Water Bile Agate

Representative Origin: Brazil

32. Malachite

Representative origin: Say, Sambiya, Mexico, Ula Mountains of the former Soviet Union.

Chemical formula: Cu2(CO3)(OH)2, belongs to a monoclinic crystal system, hardness: 3.5-4, specific gravity: 4.0, refractive index: 1.655.

33. Obsidian

Representative origin: Mexico, Indonesia, Philippines, United States, Australia,
Chapter completed!