Peridot

Moh’s Scale Hardness: 6.5-7
Specific Gravity: 3.22-3.45
Refractive Index: 1.65-1.69
Treatment: None
Origins: China, Pakistan, Myanmar (Burma), Vietnam, Australia (Queensland), Brazil (Minas Gerais), China, Kenya, Mexico, Norway (north of Bergen), South Africa, Sri Lanka (Ceylon), Tanzania and the United States (Arizona and Hawaii)