metamorphic
Tumbled greenish stone, likely serpentinite or greenstone
Probable serpentine-rich ultramafic rock; exact identification requires testing
AI-generated identification · may be incorrectBlue-green to gray-green, fine-grained, dull to waxy luster, rounded by weathering or tumbling; likely Mohs hardness 2.5–5.5, with no visible cleavage. The image is insufficient to determine crystal structure or specific gravity.
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Physical properties
Blue-green to gray-green, fine-grained, dull to waxy luster, rounded by weathering or tumbling; likely Mohs hardness 2.5–5.5, with no visible cleavage. The image is insufficient to determine crystal structure or specific gravity.
Formation & geological history
If serpentinite, it formed when mantle-derived peridotite was hydrated and metamorphosed, commonly during ancient oceanic or subduction-zone activity; age depends on its source terrain. It may also be a glacially transported greenstone.
Uses & applications
Usually collected as a decorative pebble or lapidary material; serpentinite can be polished for ornaments and carving, while related greenstones may be used locally as aggregate or dimension stone.
Geological facts
Green color commonly comes from serpentine minerals, chlorite, epidote, or amphibole. Some serpentinite contains chrysotile asbestos, so avoid cutting or generating dust until identified.
Field identification & locations
Look for a smooth, waxy surface, mottled green color, low-to-moderate hardness, and possible white veining; a streak, hardness, magnetism, and acid test would help distinguish it from slate, glass, or dyed stone. Common sources include ophiolite belts and glacial deposits.
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