mineral

Likely garnet (rough crystal)

Garnet group, likely almandine (Fe₃Al₂(SiO₄)₃); identification from the image is uncertain

AI-generated identification · may be incorrect

Dark reddish-brown, glassy to resinous luster, with irregular fractured faces; garnets have Mohs hardness 6.5–7.5 and cubic crystal structure, commonly lacking cleavage. The specimen appears small and opaque, so its specific gravity and precise composition cannot be determined visually.

Identified September 27, 2026More mineral →

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Physical properties

Formation & geological history

Garnets commonly form during regional or contact metamorphism in aluminum-rich rocks, and also occur in some igneous rocks and sediments. Their ages vary with the host rock and may span millions to billions of years.

Uses & applications

Gem-quality garnet is cut for jewelry; lower-grade material is used as an abrasive and is collected as a mineral specimen.

Geological facts

Almandine is among the most common garnets and often occurs as reddish crystals in metamorphic rocks such as schist.

Field identification & locations

Check for a dense feel, hardness near 7, and characteristic crystal faces; this fragment lacks enough visible crystal form for confident identification. Garnets occur worldwide, including India, Sri Lanka, the United States, and parts of Europe.