Rock Identifier
Likely garnet-bearing rock or almandine garnet fragment (Garnet group, probably almandine (Fe₃Al₂(SiO₄)₃)) — mineral
mineral

Likely garnet-bearing rock or almandine garnet fragment

Garnet group, probably almandine (Fe₃Al₂(SiO₄)₃)

AI-generated identification · may be incorrect

Small, irregular reddish-brown translucent fragment with vitreous to resinous luster; garnet is typically Mohs 6.5–7.5, lacks cleavage, and commonly forms equant dodecahedral crystals. The image is insufficient to confirm composition or crystal form.

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Physical properties

Small, irregular reddish-brown translucent fragment with vitreous to resinous luster; garnet is typically Mohs 6.5–7.5, lacks cleavage, and commonly forms equant dodecahedral crystals. The image is insufficient to confirm composition or crystal form.

Formation & geological history

Garnets crystallize in metamorphic rocks such as schist and gneiss, or in some igneous rocks and placer deposits; almandine commonly forms during regional metamorphism, often hundreds of millions to billions of years ago.

Uses & applications

Used as an abrasive, waterjet medium, and gemstone; attractive transparent garnet is cut for jewelry, while opaque fragments are mainly collectible or industrial.

Geological facts

Garnet is a mineral group rather than one single mineral, with colors ranging from red and brown to green, orange, and black. It is commonly recognized by its dense feel and absence of cleavage.

Field identification & locations

Look for a dark red-brown color, high density, glassy luster, and resistance to scratching; a knife should not easily scratch it. Common sources include India, Sri Lanka, Madagascar, Brazil, and metamorphic terrains worldwide.