mineral

Tumbled brown feldspar-rich rock, possibly tiger’s-eye or brecciated quartz

Indeterminate from image; likely quartz (SiO₂) with iron-stained feldspar or amphibole

AI-generated identification · may be incorrect

Brown to golden-brown, opaque to translucent edges, vitreous-to-silky luster, and irregular fractured surfaces; apparent hardness about 6–7 Mohs. No diagnostic cleavage or crystal form is clearly visible.

Identified September 18, 2026More mineral →

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At a glance

Common name: Tumbled brown feldspar-rich rock, possibly tiger’s-eye or brecciated quartz
Scientific name: Indeterminate from image; likely quartz (SiO₂) with iron-stained feldspar or amphibole
Category: mineral
Identified: September 18, 2026
Method: Standard

AI Estimated Value

About $1–$10 as an unattributed fragment; $10–$40 if confirmed and attractive tiger’s-eye or a polished lapidary specimen.

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

Likely a naturally silicified or metamorphic fragment, with coloration from iron oxides; exact age and formation setting cannot be determined photographically.

Uses & applications

Small pieces are mainly sold as curios, lapidary rough, or decorative specimens; confirmed tiger’s-eye or attractive quartz may be used in cabochons and jewelry.

Geological facts

The visible pale diagonal band could be quartz veining or a reflective fibrous layer, but the image does not establish tiger’s-eye identification.

Field identification & locations

Test hardness against glass, inspect for chatoyancy under a moving light, and check streak and cleavage; tiger’s-eye shows a strong moving silky band, while feldspar commonly cleaves. Comparable material occurs in quartz veins and metamorphic terrains worldwide.