metamorphic

Banded metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica gneiss/schist; exact identification requires thin-section or tests

AI-generated identification · may be incorrect

Gray to olive-brown, strongly foliated and banded, with a speckled mica-rich surface and possible quartz/feldspar layers; hardness about 6–7 for quartz-rich portions, with uneven fracture and variable luster.

Identified September 22, 2026More metamorphic →

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At a glance

Common name: Banded metamorphic rock, likely gneiss or schist
Scientific name: Quartz–feldspar–mica gneiss/schist; exact identification requires thin-section or tests
Category: metamorphic
Identified: September 22, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 as an ordinary hand specimen; $30–$100 if unusually attractive, polished, or provenance-documented.

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

Formed when pre-existing rock underwent intense heat and pressure, producing mineral alignment and compositional banding; commonly Precambrian to Paleozoic, though age cannot be determined visually.

Uses & applications

Used locally as building stone, facing stone, landscaping material, and aggregate; attractive pieces may be collected, but this specimen appears common and not gem-quality.

Geological facts

The light gray sparkling areas may contain mica, while the darker bands may contain biotite, amphibole, or chlorite. A streak, hardness, and acid test would help distinguish gneiss from schist or altered volcanic rock.

Field identification & locations

Common in continental mountain belts and ancient crystalline terrains, including Canada, Scandinavia, the northeastern United States, India, and Australia. Look for planar foliation, mineral alignment, and alternating light/dark bands.