metamorphic
Tumbled yellow-green stone, possibly serpentine
Serpentine-group minerals, commonly antigorite or lizardite; identification from the image is uncertain
AI-generated identification · may be incorrectOpaque, pale yellow-green with a waxy to dull luster and rounded, polished edges. Serpentine is typically Mohs 2.5–5.5, with a fine-grained, usually non-visible crystal structure; hardness and cleavage cannot be confirmed visually.
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Physical properties
Opaque, pale yellow-green with a waxy to dull luster and rounded, polished edges. Serpentine is typically Mohs 2.5–5.5, with a fine-grained, usually non-visible crystal structure; hardness and cleavage cannot be confirmed visually.
Formation & geological history
Serpentine forms when magnesium-rich rocks are altered by water, often during metamorphism; such rocks range widely in age. A precise identification or age cannot be determined from appearance alone.
Uses & applications
Tumbled serpentine is used for inexpensive jewelry, carvings, and decorative specimens; some serpentine rock is used as dimension stone.
Geological facts
Serpentine is a mineral group rather than a single mineral, and similar-looking stones can include calcite, quartz, or dyed material.
Field identification & locations
The smooth, rounded surface indicates tumbling, but color alone is not diagnostic; hardness, streak, and acid tests can help distinguish alternatives. Serpentine occurs worldwide in ultramafic-rock belts.
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