metamorphic
Rounded green-gray pebble, likely serpentinite
Serpentinite (serpentine-group minerals; identification from image is uncertain)
AI-generated identification · may be incorrectFine-grained, dull to slightly waxy green-gray surface with rounded edges. Serpentine minerals have Mohs hardness about 2.5–5.5 and monoclinic or fibrous crystal structures; the specimen’s hardness and composition cannot be confirmed visually.
Identified More metamorphic →
Explore Rounded green-gray pebble, likely serpentinite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Fine-grained, dull to slightly waxy green-gray surface with rounded edges. Serpentine minerals have Mohs hardness about 2.5–5.5 and monoclinic or fibrous crystal structures; the specimen’s hardness and composition cannot be confirmed visually.
Formation & geological history
Forms when ultramafic rocks are hydrated and altered during metamorphism, commonly along tectonic plate boundaries. The pebble’s age and source cannot be determined from the image.
Uses & applications
Serpentinite is used as decorative stone, carvings, and occasionally building stone; this small rounded specimen is primarily suitable for a collection.
Geological facts
Serpentinite can vary from pale green to dark green and may contain veins of contrasting minerals such as calcite or magnetite.
Field identification & locations
The smooth, rounded shape suggests water transport; green color alone is not diagnostic. Testing hardness, streak, and reaction to dilute acid, or examining a fresh surface, would help identify it.
More like this
