metamorphic

Weathered foliated metamorphic rock, likely schist or phyllite

Micaceous quartz–feldspar schist/phyllite; exact identification requires petrographic or chemical testing

AI-generated identification · may be incorrect

Pale gray-green, strongly foliated, fine- to medium-grained, with dull to weakly silky luster and visible mica-rich layers or veins. Typical hardness is about 2–7 depending on mica versus quartz/feldspar; cleavage follows the foliation, and density is commonly 2.6–2.8 g/cm³.

Identified September 9, 2026More metamorphic →

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At a glance

Common name: Weathered foliated metamorphic rock, likely schist or phyllite
Scientific name: Micaceous quartz–feldspar schist/phyllite; exact identification requires petrographic or chemical testing
Category: metamorphic
Identified: September 9, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 for a common hand specimen; larger, highly attractive or locality-labeled pieces may bring $30–$75.

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 shale or another fine-grained sediment was buried, heated, and compressed during regional metamorphism, commonly during mountain building. Its precise geological age cannot be determined from the photograph and depends on its source region.

Uses & applications

Used locally as decorative stone, landscaping material, wall stone, or aggregate; attractive mica-rich pieces may be collected, but this specimen does not appear gem quality.

Geological facts

The alternating light and dark bands reflect mineral segregation during metamorphism. The pale yellow-green material may be mica, epidote, or a weathering product, while the brown areas are likely iron-oxide staining or weathered biotite.

Field identification & locations

Look for planar foliation, flaky mica, and layers that split along aligned minerals; a streak, hardness, acid, and fresh-break test can distinguish schist from phyllite and slate. Common in regional metamorphic belts worldwide, including the Appalachians, Alps, and Himalaya.