metamorphic

Large rounded boulder, likely foliated metamorphic rock (possibly gneiss or schist)

Undetermined foliated silicate rock; mineral species cannot be confirmed from the photograph

AI-generated identification · may be incorrect

Gray-green with rusty-brown weathering and pronounced wavy foliation or banding; grains are not clearly resolved. Hardness, luster, crystal structure, cleavage, and density cannot be reliably determined from the image.

Identified October 13, 2026More metamorphic →

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At a glance

Common name: Large rounded boulder, likely foliated metamorphic rock (possibly gneiss or schist)
Scientific name: Undetermined foliated silicate rock; mineral species cannot be confirmed from the photograph
Category: metamorphic
Identified: October 13, 2026
Method: Standard

AI Estimated Value

Approximately $50–$500 as a landscape boulder, with substantial variation by size, locality, and delivery costs.

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 metamorphic, it formed when pre-existing rock was altered by heat and pressure, with minerals aligned into bands. Its age and exact formation setting require a fresh surface and geological context.

Uses & applications

May be used as landscape stone, garden boulder, or dimension stone; value is mainly practical and depends on size, appearance, and local transport costs.

Geological facts

The rounded shape likely reflects prolonged weathering and transport, while the dark wavy seams may be mineral bands, fractures, or veins.

Field identification & locations

Look for alternating mineral-rich bands and interlocking grains on a clean, freshly broken surface; field identification is uncertain from this weathered view. Similar rocks occur in old metamorphic terrains worldwide.