metamorphic

Polished garnet-bearing metamorphic rock (likely garnet schist)

Garnet schist; commonly garnet (often almandine, Fe₃Al₂(SiO₄)₃) in mica-rich rock

AI-generated identification · may be incorrect

The small polished pebble shows reddish-brown and gray-green areas with a glossy surface; visible texture is consistent with garnet and mica or other silicate minerals. Garnet hardness is about 6.5–7.5 Mohs; exact composition and properties cannot be confirmed from the image.

Identified October 13, 2026More metamorphic →

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At a glance

Common name: Polished garnet-bearing metamorphic rock (likely garnet schist)
Scientific name: Garnet schist; commonly garnet (often almandine, Fe₃Al₂(SiO₄)₃) in mica-rich rock
Category: metamorphic
Identified: October 13, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common polished specimen; higher if its locality or gem-quality garnet is verified.

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

Likely formed when clay-rich sediment was buried, heated, and compressed during regional metamorphism; garnet grew during recrystallization. Such rocks form across many geological ages.

Uses & applications

Used as a decorative or lapidary stone; garnet minerals are also used as abrasives and, when transparent and attractive, in jewelry.

Geological facts

Garnet is a group of silicate minerals, not a single mineral species; its color ranges beyond red, and its crystals commonly form in metamorphic rocks.

Field identification & locations

Look for conspicuous garnet grains within a foliated, mica-rich matrix; a polished pebble can obscure this texture. Garnet schists occur in metamorphic belts worldwide, but locality cannot be inferred here.