metamorphic
Green serpentine or nephrite-like stone
Serpentine-group minerals, chiefly antigorite/lizardite; possibly nephrite jade (actinolite)
AI-generated identification · may be incorrectSmall pale green, opaque, mottled specimen with a waxy to dull luster; likely Mohs 2.5–5.5 (serpentine) or 6–6.5 if nephrite. Crystal structure is typically fine-grained and non-cleavable; specific gravity is approximately 2.5–3.0.
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Physical properties
Small pale green, opaque, mottled specimen with a waxy to dull luster; likely Mohs 2.5–5.5 (serpentine) or 6–6.5 if nephrite. Crystal structure is typically fine-grained and non-cleavable; specific gravity is approximately 2.5–3.0.
Formation & geological history
Serpentine forms when ultramafic rocks are hydrated during hydrothermal alteration, commonly in ancient ophiolites and subduction zones. Nephrite forms when actinolite-rich rocks undergo metamorphism; age depends on locality.
Uses & applications
Serpentine is used for carvings, ornamental stone, and occasionally countertops; higher-quality nephrite is used in jewelry and sculpture. This small, rough piece has limited commercial value.
Geological facts
The image is not sharp enough for a definitive identification, and green serpentine is frequently mistaken for jade. A hardness test, streak, translucency, and specific-gravity measurement would help distinguish them.
Field identification & locations
Commonly found in serpentinite belts, including California, New Zealand, Canada, Russia, and China. Look for a greasy/waxy feel and mottled green color; avoid acid or destructive tests without permission.
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