mineral

Peridot (rough olivine crystals)

Olivine, chiefly forsterite–fayalite solid solution, (Mg,Fe)₂SiO₄; gem-quality olivine is called peridot

AI-generated identification · may be incorrect

Small translucent olive-green to yellow-green grains with glassy luster and irregular to partly crystal-like faces. Mohs hardness 6.5–7; orthorhombic crystal structure; poor cleavage and uneven to conchoidal fracture. The photo does not establish exact composition or quality.

Identified October 5, 2026More mineral →

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At a glance

Common name: Peridot (rough olivine crystals)
Scientific name: Olivine, chiefly forsterite–fayalite solid solution, (Mg,Fe)₂SiO₄; gem-quality olivine is called peridot
Category: mineral
Identified: October 5, 2026
Method: Standard

AI Estimated Value

Approximately $1–$20 for small, common rough grains; larger, cleaner gem-grade crystals can be worth substantially more.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Olivine crystallizes in magnesium-rich igneous rocks, especially basalt and peridotite, and can also occur in meteorites. Its age depends on the source deposit; no locality or age can be determined from the image.

Uses & applications

Gem-quality pieces are cut for jewelry; lower-grade olivine is collected as mineral specimens and sometimes used as foundry sand or refractory material.

Geological facts

Peridot is the gem variety of olivine, not a separate mineral species. Olivine is a major mineral in Earth’s upper mantle.

Field identification & locations

The olive-green color and glassy appearance are consistent with rough peridot, but similar-looking minerals can be confused in a photo. Common sources include Myanmar, Pakistan, Arizona, China, and volcanic deposits; confirm identity with hardness, refractive properties, or testing.