metamorphic

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

Unconfirmed; potentially almandine garnet (Fe₃Al₂(SiO₄)₃) in a metamorphic host

AI-generated identification · may be incorrect

Small, rough specimen with a dark, possibly crystalline upper portion and reddish-purple lower portion. If the red area is garnet, its hardness is about 6.5–7.5 Mohs and luster vitreous; the photo is too unclear to establish composition or crystal structure.

Identified September 28, 2026More metamorphic →

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Physical properties

Formation & geological history

Garnets commonly form during regional metamorphism of aluminum-rich rocks, often hundreds of millions to billions of years ago; this specimen’s origin cannot be determined from the image.

Uses & applications

Garnet is used as an abrasive and, when transparent and well-formed, as a gemstone; rough matrix specimens are mainly collected.

Geological facts

Almandine is the most common garnet species and is typically deep red to reddish brown.

Field identification & locations

The image does not show enough detail for a reliable identification. A garnet is typically hard, dense, and may display distinct crystal faces; locality or a hardness/streak test would help distinguish it from other rocks.