metamorphic

Rough garnet-bearing rock, likely almandine garnet in matrix

Almandine garnet, Fe₃Al₂(SiO₄)₃; exact host rock cannot be determined from the image

AI-generated identification · may be incorrect

Reddish-brown, rough and partly lustrous; garnet is typically Mohs 7–7.5, cubic crystal system, without cleavage, and specific gravity about 3.5–4.3. The specimen appears matrix-bound rather than gem quality.

Identified September 28, 2026More metamorphic →

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At a glance

Common name: Rough garnet-bearing rock, likely almandine garnet in matrix
Scientific name: Almandine garnet, Fe₃Al₂(SiO₄)₃; exact host rock cannot be determined from the image
Category: metamorphic
Identified: September 28, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small, common rough specimen; more if the garnet crystals are unusually large or well formed.

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

Garnet commonly forms during regional metamorphism of aluminum-rich rocks, often in schist or gneiss; such rocks range widely in age and occur in ancient mountain belts.

Uses & applications

Garnet is used as an abrasive and, when clear and well-formed, in jewelry; this small rough piece is mainly a collector specimen.

Geological facts

Almandine is among the most common garnet species. Garnet grains often survive weathering and can concentrate in stream and beach sands.

Field identification & locations

Look for hard, red-brown grains or crystals with a glassy luster and no cleavage, commonly in metamorphic rock. The photo alone does not confirm the mineral species or host rock.