mineral

Polished banded stone, likely labradorite or banded gabbro

Indeterminate from image; possibly plagioclase-rich gabbro/anorthosite or labradorite-bearing rock

AI-generated identification · may be incorrect

Dark gray to black, rounded and polished, with pale wavy banding and weak surface sheen. Likely hardness about 6–7 Mohs; composition and crystal structure cannot be confirmed without testing.

Identified September 19, 2026More mineral →

Explore Polished banded stone, likely labradorite or banded gabbro in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Polished banded stone, likely labradorite or banded gabbro
Scientific name: Indeterminate from image; possibly plagioclase-rich gabbro/anorthosite or labradorite-bearing rock
Category: mineral
Identified: September 19, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 for a small polished common specimen; potentially $30–$100 if it displays attractive labradorescence or unusual banding.

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

Dark gray to black, rounded and polished, with pale wavy banding and weak surface sheen. Likely hardness about 6–7 Mohs; composition and crystal structure cannot be confirmed without testing.

Formation & geological history

Likely an igneous specimen formed by slow cooling of mafic magma, producing interlocking feldspar and pyroxene crystals; age depends on locality and may range from Precambrian to recent geological settings.

Uses & applications

Primarily a decorative or worry stone; comparable material may be used for cabochons, carvings, countertops, and collector specimens.

Geological facts

The curved light bands may reflect feldspar-rich layering, flow texture, or polishing across mineral boundaries rather than true sedimentary bedding.

Field identification & locations

Check for glassy feldspar flashes, visible interlocking grains, and a nonmetallic streak; a streak, hardness, magnetism, and specific-gravity test would improve identification. Common analogues occur in igneous provinces worldwide, including Canada, Madagascar, Scandinavia, and India.