metamorphic

Polished banded stone, likely labradorite or gneiss

Probably feldspar-rich gneiss; possible labradorite-bearing rock (plagioclase feldspar, chiefly (Ca,Na)(Al,Si)₄O₈)

AI-generated identification · may be incorrect

Gray-green, rounded and polished, with pale and golden irregular bands or flashes; likely hardness 6–6.5, vitreous to dull luster, granular crystal structure, and poor cleavage visible only microscopically.

Identified September 2, 2026More metamorphic →

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At a glance

Common name: Polished banded stone, likely labradorite or gneiss
Scientific name: Probably feldspar-rich gneiss; possible labradorite-bearing rock (plagioclase feldspar, chiefly (Ca,Na)(Al,Si)₄O₈)
Category: metamorphic
Identified: September 2, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a common polished specimen; $30–$100+ if it displays strong labradorescence or is a high-quality cabochon.

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

If gneiss, it formed by high-grade metamorphism of feldspar- and quartz-rich rock during Precambrian or younger mountain-building events. If labradorite-rich, the color play results from light interference in layered plagioclase crystals.

Uses & applications

Used as a decorative stone, cabochon, worry stone, or collectible; similar feldspathic rocks are also used for architectural slabs and aggregate.

Geological facts

The photograph is out of focus, so exact identification is uncertain; the golden-blue sheen may represent labradorescence rather than true banding.

Field identification & locations

Look for feldspar flashes that shift with viewing angle, a glassy feel, and resistance to scratching by a steel knife; common sources include Madagascar, Finland, Canada, Norway, and India. A gemological test or clearer image is needed for confirmation.