gemstone

Green obsidian (likely moldavite)

Natural volcanic glass; if extraterrestrial-impact glass, moldavite (tektite)

AI-generated identification · may be incorrect

Translucent olive-green glass with strong vitreous luster, conchoidal fracture, and no cleavage; Mohs hardness about 5–5.5, amorphous structure, and specific gravity around 2.3–2.5. The rough, sculpted surface is consistent with moldavite, though lighting and appearance prevent certainty.

Identified September 12, 2026More gemstone →

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At a glance

Common name: Green obsidian (likely moldavite)
Scientific name: Natural volcanic glass; if extraterrestrial-impact glass, moldavite (tektite)
Category: gemstone
Identified: September 12, 2026
Method: Standard

AI Estimated Value

Common genuine moldavite: about $20–$100 per gram; exceptional sculptural specimens may exceed $200 per gram. Ordinary green obsidian is typically $5–$30.

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

Obsidian forms when silica-rich lava cools too rapidly to crystallize; moldavite formed about 14.7 million years ago when the Ries impact melted terrestrial rocks and splashed glass across central Europe. Moldavite commonly occurs in Miocene sediments of the Czech Republic.

Uses & applications

Used as a collectible gemstone and in pendants or cabochons; ordinary green obsidian is mainly ornamental. Genuine moldavite has significant lapidary and collector demand.

Geological facts

Moldavite’s characteristic etched, pitted surface and bottle-green color distinguish it from most obsidian; abundant convincing fakes are made from green glass.

Field identification & locations

Check for natural sculpted etching, internal bubbles or flow textures, conchoidal fracture, and locality documentation; laboratory testing is recommended. Common moldavite localities include southern Bohemia and Moravia, Czech Republic.