metamorphic

Likely garnet-bearing rock fragment

Garnet-bearing schist or gneiss; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃

AI-generated identification · may be incorrect

The small rough specimen appears dark reddish-brown with sparkly grains, but the photo is not detailed enough to confirm its minerals. Garnet has Mohs hardness 6.5–7.5, a vitreous luster, and commonly forms dodecahedral crystals; the host rock’s properties vary.

Identified September 24, 2026More metamorphic →

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Physical properties

Formation & geological history

Garnet-bearing metamorphic rocks form when aluminum-rich sediments are altered by heat and pressure during regional metamorphism. Garnet growth commonly occurs over geologic timescales at elevated temperatures and pressures.

Uses & applications

Suitable garnet crystals may be cut as gemstones; lower-grade garnet is used as an abrasive. Garnet-bearing rock is also collected as a geological specimen.

Geological facts

Garnet is a mineral group rather than a single mineral, and its color ranges beyond red. A clear, well-formed crystal would be needed for a more specific identification.

Field identification & locations

Look for hard, glassy red-brown grains embedded in foliated or banded rock; garnet crystals often show distinct many-sided shapes. Such rocks occur in metamorphic belts worldwide, including parts of the Appalachians, Scandinavia, and the Himalaya.