mineral

Blue chalcedony cabochon (likely)

Chalcedony, microcrystalline SiO₂; possibly blue agate or common opal, which cannot be distinguished confidently from the image

AI-generated identification · may be incorrect

Pale blue-white, translucent to opaque, waxy/glassy luster, with dark inclusions. If chalcedony: Mohs 6.5–7, trigonal microcrystalline quartz, no cleavage; the polished cabochon is mounted in a dark setting.

Identified September 27, 2026More mineral →

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At a glance

Common name: Blue chalcedony cabochon (likely)
Scientific name: Chalcedony, microcrystalline SiO₂; possibly blue agate or common opal, which cannot be distinguished confidently from the image
Category: mineral
Identified: September 27, 2026
Method: Standard

AI Estimated Value

Approximately $5–$40 for a small, ordinary cabochon; higher prices require confirmed material, quality, and craftsmanship.

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

Chalcedony forms as silica-rich fluids fill cavities and fractures, commonly in volcanic rocks; deposits range from ancient to recent. The image does not establish the specimen’s geological age or locality.

Uses & applications

Cabochons are used in jewelry and decorative objects; chalcedony is also collected as a lapidary material.

Geological facts

Chalcedony is made of microscopic quartz crystals, so it lacks the visible crystal faces of ordinary quartz.

Field identification & locations

Look for hardness near 7, a smooth waxy surface, and conchoidal fracture on an unpolished piece. The mounted stone’s identity and locality cannot be confirmed visually.