mineral

Blue chalcedony (likely druzy quartz-bearing rough)

Microcrystalline quartz, SiO₂; possibly quartz with minor iron-oxide inclusions

AI-generated identification · may be incorrect

Pale blue-gray, translucent to semi-opaque, with a glassy to waxy luster and sparkly drusy crystal surfaces. Quartz hardness is about 7 Mohs, lacks cleavage, has a cryptocrystalline fibrous structure, and specific gravity near 2.6; the rusty yellow areas are likely iron oxides or matrix.

Identified September 13, 2026More mineral →

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At a glance

Common name: Blue chalcedony (likely druzy quartz-bearing rough)
Scientific name: Microcrystalline quartz, SiO₂; possibly quartz with minor iron-oxide inclusions
Category: mineral
Identified: September 13, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 for a small common rough specimen; $30–$100+ if naturally vivid blue, attractive, and suitable for cutting.

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

Forms when silica-rich groundwater deposits quartz in cavities, fractures, or vesicles, commonly during volcanic or hydrothermal activity. The specimen’s exact geological age and locality cannot be determined from the image.

Uses & applications

Used for cabochons, beads, carvings, lapidary pieces, and mineral collections; blue chalcedony is also a popular ornamental gemstone. It is not typically used as structural stone.

Geological facts

The blue color may result from microscopic inclusions, light scattering, or trace minerals; natural color is often uneven. Drusy surfaces consist of many tiny quartz crystals lining a cavity.

Field identification & locations

Identify it by its blue translucent body, waxy chalcedony texture, quartz-like sparkle, and resistance to scratching by steel; a hardness or specific-gravity test can confirm quartz. Common sources include Turkey, Namibia, Madagascar, Brazil, and the United States.