mineral

Tumbled orange chalcedony and a gray stone disk

Chalcedony (microcrystalline quartz, SiO₂); disk likely fine-grained sandstone or slate

AI-generated identification · may be incorrect

The orange pebble is polished, translucent-to-opaque, with waxy luster and Mohs hardness about 6.5–7. The larger disk is pale gray, fine-grained, matte, and appears moderately hard, but its exact identity cannot be confirmed from the image.

Identified August 11, 2026More mineral →

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At a glance

Common name: Tumbled orange chalcedony and a gray stone disk
Scientific name: Chalcedony (microcrystalline quartz, SiO₂); disk likely fine-grained sandstone or slate
Category: mineral
Identified: August 11, 2026
Method: Standard

AI Estimated Value

About $2–$15 for the small tumbled chalcedony; $1–$10 for the unidentified stone disk, depending on material and workmanship.

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 when silica-rich fluids fill cavities and fractures, commonly in volcanic rocks. The disk appears human-cut from a sedimentary or metamorphic stone; its geological age and formation depend on the source material.

Uses & applications

Chalcedony is used for cabochons, beads, carvings, and inexpensive collector specimens. Stone disks may serve as coasters, polishing blanks, or educational samples.

Geological facts

Orange chalcedony may be naturally colored by iron oxides or resemble carnelian. A definitive disk identification would require a close view, streak, hardness, and acid or mineralogical testing.

Field identification & locations

Identify chalcedony by its smooth waxy luster, lack of cleavage, conchoidal fracture, and resistance to scratching glass. Common sources include Brazil, India, Madagascar, Uruguay, and the western United States.