metamorphic

Greenstone (likely serpentine-rich rock)

Serpentinite, composed mainly of serpentine-group minerals

AI-generated identification · may be incorrect

Pale green to yellow-green, mottled, with a dull to slightly waxy luster and irregular fracture; serpentine hardness is about 2.5–5.5 Mohs. The small, weathered specimen does not show diagnostic crystals, so identification from the photo is tentative.

Identified October 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when ultramafic rocks are altered by water during metamorphism, commonly near ancient or active tectonic plate boundaries; ages vary widely.

Uses & applications

Serpentinite is used as decorative stone, carving material, and historically as a source of asbestos-bearing minerals; attractive material may be polished for ornaments.

Geological facts

“Greenstone” is a broad field term for green-colored altered rock, not a precise mineral identification.

Field identification & locations

Look for a green color, waxy feel, and relatively low hardness; common in metamorphic belts and ophiolites. A fresh surface or mineral tests would be needed to distinguish serpentinite from other green rocks.