metamorphic

Rough garnet-bearing metamorphic rock

Likely garnet amphibolite or garnet-bearing schist; garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂)

AI-generated identification · may be incorrect

Dark green-black, reddish-brown, and wine-red material with a dull to vitreous luster and irregular fracture; likely garnet grains in an amphibole- or mica-rich matrix. Garnet hardness is about 6.5–7.5 Mohs, while the matrix may be softer;…

Identified September 21, 2026More metamorphic →

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At a glance

Common name: Rough garnet-bearing metamorphic rock
Scientific name: Likely garnet amphibolite or garnet-bearing schist; garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂)
Category: metamorphic
Identified: September 21, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a common rough specimen; $30–$100+ if garnet crystals are well exposed or unusually attractive.

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 iron- and magnesium-rich sedimentary or igneous rocks underwent medium- to high-grade metamorphism, commonly during mountain building. Exact geological age cannot be determined from the photograph.

Uses & applications

Mostly collected as a natural specimen or lapidary rough; garnet may be cut as a gemstone or used abrasively, while amphibolite can serve as crushed stone or decorative rock.

Geological facts

The red areas may be garnet, but the image does not show diagnostic crystal faces or a fresh fracture, so visual identification is provisional.

Field identification & locations

Look for hard, glassy red crystals, granular texture, and resistance to scratching; a streak, hardness test, and thin-section or X-ray analysis would confirm it. Common settings include metamorphic belts worldwide, including India, Madagascar, the United States, and Scandinavia.