mineral

Tumbled brown stone, likely tiger’s-eye or jasper

Quartz-rich microcrystalline silica, likely SiO₂ (possible tiger’s-eye; identification uncertain from image)

AI-generated identification · may be incorrect

Small polished pebble with brown, olive, and dark bands, opaque to weakly translucent, vitreous-to-waxy luster, and no visible cleavage. Likely hardness about 6.5–7 Mohs; specific gravity approximately 2.6–2.7.

Identified August 12, 2026More mineral →

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At a glance

Common name: Tumbled brown stone, likely tiger’s-eye or jasper
Scientific name: Quartz-rich microcrystalline silica, likely SiO₂ (possible tiger’s-eye; identification uncertain from image)
Category: mineral
Identified: August 12, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small tumbled piece; $10–$50 if it proves to be attractive natural tiger’s-eye.

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

Tiger’s-eye forms when fibrous crocidolite is pseudomorphed by quartz during hydrothermal alteration; jasper forms from silica-rich replacement or sedimentation. Common specimens are Precambrian to younger, depending on locality.

Uses & applications

Used for cabochons, beads, carvings, and inexpensive polished stones; rarely used industrially because pieces are small and decorative.

Geological facts

A chatoyant tiger’s-eye shows a moving silky band when rotated under light; this specimen appears banded but lacks clearly visible chatoyancy.

Field identification & locations

Commonly found in South Africa, Western Australia, India, Brazil, and the United States. Confirm with a strong light for chatoyancy and a hardness test against glass; avoid scratching the polished surface.