metamorphic
Tumbled green serpentine
Serpentine-group minerals, chiefly antigorite and lizardite; commonly Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectPale olive-green, mottled, waxy to dull luster, opaque to slightly translucent, and fine-grained rather than visibly crystalline. Mohs hardness is typically 2.5–4; cleavage is poor or indistinct, with specific gravity about 2.5–2.6.
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Physical properties
Pale olive-green, mottled, waxy to dull luster, opaque to slightly translucent, and fine-grained rather than visibly crystalline. Mohs hardness is typically 2.5–4; cleavage is poor or indistinct, with specific gravity about 2.5–2.6.
Formation & geological history
Forms when magnesium-rich ultramafic rocks such as peridotite undergo hydration and alteration, commonly in oceanic crust and subduction-related settings. Serpentinization ranges from ancient Precambrian to modern geological processes.
Uses & applications
Used as ornamental stone, carvings, beads, and tumbled specimens; some varieties are used as decorative building stone. This small piece has modest lapidary or collector value.
Geological facts
The specimen’s rounded shape and smooth surface indicate human tumbling, while its cloudy green color and mottling are consistent with serpentine rather than a transparent gemstone.
Field identification & locations
Common sources include California, Vermont, New Zealand, Italy, Canada, and Afghanistan. Field identification relies on green color, waxy feel, low hardness, light weight, and association with ultramafic rocks; avoid inhaling dust because some serpentine deposits contain asbestos-forming minerals.
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