metamorphic

Tumbled garnet-bearing rock, likely garnet schist

Garnet (typically almandine, Fe₃Al₂(SiO₄)₃) in a quartz–mica matrix; exact identification is uncertain from the photo

AI-generated identification · may be incorrect

Rounded, polished dark reddish-brown specimen with small reflective grains. Garnet is Mohs 6.5–7.5, commonly vitreous, and forms cubic-system crystals; matrix minerals may be softer and show cleavage.

Identified September 29, 2026More metamorphic →

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At a glance

Common name: Tumbled garnet-bearing rock, likely garnet schist
Scientific name: Garnet (typically almandine, Fe₃Al₂(SiO₄)₃) in a quartz–mica matrix; exact identification is uncertain from the photo
Category: metamorphic
Identified: September 29, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common tumbled specimen; more if confirmed, unusually attractive, or gem-quality.

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 grows during regional metamorphism of aluminum-rich rocks under heat and pressure. Such rocks form across many geological ages and mountain belts.

Uses & applications

Garnet is used as an abrasive and, when transparent and attractive, as a gemstone; garnet-bearing specimens are also collected.

Geological facts

Almandine is the most common garnet species and often appears deep red to brown. The image does not show enough detail to confirm the species or host rock.

Field identification & locations

Look for hard, glassy red-brown grains, often with rounded or dodecahedral crystal shapes, in a contrasting matrix. Garnet-bearing metamorphic rocks occur worldwide, including the United States, India, and Madagascar.