metamorphic
Pale green rounded boulder, likely altered serpentinite or greenstone
Probable serpentinized ultramafic rock; exact identification requires testing
AI-generated identification · may be incorrectLight green, massive, smooth-weathered surface with small pits and faint pale veins; likely hardness about 3–5.5 Mohs, dull to waxy luster, no obvious cleavage, and moderate-to-high density.
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Physical properties
Light green, massive, smooth-weathered surface with small pits and faint pale veins; likely hardness about 3–5.5 Mohs, dull to waxy luster, no obvious cleavage, and moderate-to-high density.
Formation & geological history
Likely formed when mantle-derived peridotite was metamorphically altered by hydrothermal fluids, commonly during plate-boundary processes; age cannot be determined from the image. Its rounded form reflects stream or glacial abrasion and weathering.
Uses & applications
Serpentinite and related greenstones are used as decorative stone, carvings, landscaping material, and occasionally jewelry; this specimen has mainly educational or collecting value.
Geological facts
Serpentinite commonly contains serpentine minerals such as antigorite, lizardite, and chrysotile, plus magnetite and minor carbonate. Some varieties may contain asbestos-form minerals, so avoid cutting, grinding, or producing dust.
Field identification & locations
Check for a waxy feel, green streak or powder, relatively soft scratching by a steel knife, and possible magnetism; acid reaction is usually weak unless carbonate-rich. Common in California, the Appalachian region, New Zealand, and other former ophiolite zones.
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