metamorphic
Small gray-green tumbled stone, likely serpentine
Serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄; identification is uncertain from the image alone
AI-generated identification · may be incorrectRounded, opaque gray-green pebble with a dull to slightly waxy luster. Serpentine has Mohs hardness about 2.5–5.5 and a monoclinic or trigonal crystal structure; the specimen’s specific gravity and cleavage cannot be determined visually.
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Physical properties
Rounded, opaque gray-green pebble with a dull to slightly waxy luster. Serpentine has Mohs hardness about 2.5–5.5 and a monoclinic or trigonal crystal structure; the specimen’s specific gravity and cleavage cannot be determined visually.
Formation & geological history
Serpentine forms when water alters magnesium-rich ultramafic rocks, commonly during metamorphism; these rocks range widely in age. The pebble appears mechanically tumbled or naturally rounded.
Uses & applications
Serpentine is used as ornamental stone, carvings, and sometimes jewelry; this small, unverified pebble has little commercial value.
Geological facts
Serpentine is a mineral group, not a single mineral, and can be confused with jade or other green stones.
Field identification & locations
A green-gray color and waxy feel can suggest serpentine, but hardness and mineral tests are needed to distinguish it reliably. Serpentinite occurs in many mountain belts and ophiolite zones worldwide.
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