metamorphic
Small polished green stone, possibly serpentine or greenstone
Likely serpentine-rich rock; exact identification is limited by the blurred image
AI-generated identification · may be incorrectRounded, smooth, dull-to-waxy green surface with dark mottling; likely Mohs hardness 2.5–5.5 and no visible crystals or cleavage. Specific gravity may be approximately 2.5–2.7.
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Physical properties
Rounded, smooth, dull-to-waxy green surface with dark mottling; likely Mohs hardness 2.5–5.5 and no visible crystals or cleavage. Specific gravity may be approximately 2.5–2.7.
Formation & geological history
Serpentine forms when ultramafic mantle rocks undergo hydration during metamorphism, commonly in tectonic plate boundaries; its age varies widely from Precambrian to modern tectonic settings.
Uses & applications
Used as a carving and ornamental stone, beads, cabochons, and decorative objects; low-grade material has limited commercial value.
Geological facts
Serpentine is a mineral-group name rather than one mineral, chiefly including lizardite, chrysotile, and antigorite. Greenstone is a broader informal term that can also describe altered basalt or jade-like material.
Field identification & locations
Look for a greasy or waxy feel, green color, dark veins, low hardness, and possible white streak; a steel knife may scratch softer serpentine. Common localities include California, Italy, New Zealand, Canada, and Afghanistan.
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