Peridot

Physical Properties

Hardness: 6.5-7.0 (Mohs). Color: Olive-green to yellow-green. Luster: Vitreous (glassy). Crystal structure: Orthorhombic. Cleavage: Poor. Specific gravity: 3.27-3.37.

Formation & Geological History

Forms deep within the Earth's mantle and is brought to the surface by volcanic activity; found in mafic and ultramafic igneous rocks. It is one of the few gemstones that occurs in only one color.

Uses & Applications

Primarily used as a gemstone in jewelry (rings, necklaces, earrings). It is the birthstone for August. High-quality specimens are valuable to collectors.

Geological Facts

Peridot is known as the 'Evening Emerald' because it glows brilliantly under artificial light. It has also been found in pallasite meteorites, meaning some specimens are extraterrestrial.

Field Identification & Locations

Identified by its distinctive lime or olive green color and high double refraction. Commonly found in San Carlos Apache Reservation in Arizona, Pakistan, Myanmar, and volcanic islands like Hawaii.

Identified on: 5/17/2026

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