metamorphic

Likely rough garnet-bearing metamorphic rock

Garnet schist or garnet amphibolite; reddish areas may be almandine garnet (Fe₃Al₂Si₃O₁₂)

AI-generated identification · may be incorrect

Dark reddish-brown, gray, and black specimen with a glassy to submetallic luster and irregular fractures; apparent hardness about 6–7 Mohs. The image does not clearly show diagnostic crystal faces, cleavage, or grain texture, so exact identification is uncertain.

Identified September 6, 2026More metamorphic →

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At a glance

Common name: Likely rough garnet-bearing metamorphic rock
Scientific name: Garnet schist or garnet amphibolite; reddish areas may be almandine garnet (Fe₃Al₂Si₃O₁₂)
Category: metamorphic
Identified: September 6, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common rough specimen; $30–$100+ if it contains large, well-formed garnet crystals or has exceptional color and provenance.

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 by regional metamorphism of a clay-rich or mafic protolith under elevated pressure and temperature, commonly during mountain building; age depends on locality and cannot be determined visually.

Uses & applications

Decorative and educational specimen; garnet-rich material may be used abrasively, while attractive garnets can be cut as gemstones. Matrix rock has limited commercial value.

Geological facts

Garnet commonly occurs as hard, rounded porphyroblasts in schist and amphibolite. A streak, hardness, density, and close inspection for distinct garnet grains would help distinguish it from jasper, slag, or iron-rich chert.

Field identification & locations

Common in metamorphic belts worldwide, including India, Sri Lanka, Norway, the Alps, and the Appalachian Mountains. Test with a steel file or quartz, inspect with magnification, and avoid assuming the red color alone proves garnet.