metamorphic

Likely garnet-bearing rock (possibly almandine garnet in matrix)

Garnet, likely almandine (Fe₃Al₂Si₃O₁₂); host rock cannot be determined from the image

AI-generated identification · may be incorrect

Rough, reddish-brown specimen with a granular surface; garnet is typically Mohs 6.5–7.5, vitreous, cubic, and lacks cleavage, with uneven to conchoidal fracture. The photo does not show enough detail to confirm crystals or composition.

Identified October 4, 2026More metamorphic →

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At a glance

Common name: Likely garnet-bearing rock (possibly almandine garnet in matrix)
Scientific name: Garnet, likely almandine (Fe₃Al₂Si₃O₁₂); host rock cannot be determined from the image
Category: metamorphic
Identified: October 4, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small, common rough specimen; higher-quality crystal specimens can be worth more.

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

Almandine commonly forms during regional metamorphism of aluminum-rich sediments, often in schist or gneiss; such rocks range from hundreds of millions to billions of years old. The specimen’s specific age and origin are unknown.

Uses & applications

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

Geological facts

Garnet is a mineral group rather than a single mineral; almandine is among its most common species.

Field identification & locations

Look for distinct deep-red crystals with a glassy luster and no cleavage, often embedded in metamorphic rock. Common sources include India, Sri Lanka, Madagascar, and parts of the United States; the pictured piece is not identifiable to locality.