mineral

Likely garnet (rough crystal)

Garnet group; possibly almandine, (Fe₃Al₂(SiO₄)₃)

AI-generated identification · may be incorrect

Small, dark reddish-brown to nearly black, glassy rough grain with irregular to partly crystal-like faces. Garnet hardness is 6.5–7.5 Mohs; the group commonly crystallizes in the cubic system and has no cleavage. The photo alone cannot confirm its identity or species.

Identified October 4, 2026More mineral →

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Physical properties

Formation & geological history

Garnets form in several rock types, especially during metamorphism of aluminum-rich rocks; some also crystallize in igneous rocks. Their ages vary widely with the host rocks and cannot be determined from this image.

Uses & applications

Garnets are used as gemstones and, when not gem quality, as abrasives and waterjet-cutting media.

Geological facts

Garnet is a mineral group rather than a single mineral, with colors and chemistry that vary by species.

Field identification & locations

A dark garnet is plausible, but the specimen is too small and lacks a clear diagnostic crystal shape for confident identification. Garnets occur worldwide in metamorphic rocks and stream gravels; hardness testing and examination of a fresh surface could help distinguish it from other dark minerals.