mineral

Garnet, likely almandine–spessartine

Garnet-group nesosilicate; commonly almandine Fe₃Al₂(SiO₄)₃ or spessartine Mn₃Al₂(SiO₄)₃

AI-generated identification · may be incorrect

Small rounded, water-worn crystal with dark reddish-brown to amber translucent areas and vitreous luster. Garnet hardness is typically Mohs 6.5–7.5, lacks cleavage, has a cubic crystal structure, and specific gravity around 3.5–4.3.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Garnets commonly form in metamorphic rocks such as schist and gneiss, though some occur in igneous rocks and placer deposits; individual grains may be millions to billions of years old and later concentrated by stream erosion.

Uses & applications

Used as an abrasive, waterjet medium, industrial blasting material, and gemstone; attractive transparent pieces are cut or polished for jewelry.

Geological facts

Garnet is a mineral group rather than one single mineral species. The rounded surface and concentrated color suggest a stream-worn placer garnet, possibly mixed with iron-rich varieties.

Field identification & locations

Identify it by its unusually high density, glassy luster, reddish-brown color, absence of cleavage, and resistance to scratching; it should scratch glass. Common sources include metamorphic terrains and stream gravels worldwide, especially India, Sri Lanka, Madagascar, and the United States.