metamorphic
Tumbled banded stone, likely serpentine or chlorite-rich rock
Probable serpentinite (serpentine-group minerals: Mg₃Si₂O₅(OH)₄), possibly greenstone
AI-generated identification · may be incorrectDark olive-green and gray with curved pale bands, waxy-to-dull luster, and rounded/tumbled surfaces; likely Mohs hardness 2.5–4, with no visible cleavage. Specific gravity is approximately 2.5–2.7.
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Physical properties
Dark olive-green and gray with curved pale bands, waxy-to-dull luster, and rounded/tumbled surfaces; likely Mohs hardness 2.5–4, with no visible cleavage. Specific gravity is approximately 2.5–2.7.
Formation & geological history
Likely formed by hydrothermal alteration of ultramafic mantle rock, commonly during oceanic crust formation or mountain-building; serpentinite may range from Precambrian to modern geological settings.
Uses & applications
Used as a decorative stone, polished pebble, carving material, and occasionally as architectural stone; generally low commercial value unless unusually patterned or from a notable locality.
Geological facts
The image supports only a probable identification because scale, translucency, and testing details are unavailable. Serpentine commonly shows mottled green colors and fibrous or vein-like banding.
Field identification & locations
Common in ophiolites and tectonic mountain belts, including California, Italy, New Zealand, and the Canadian Appalachians. Field clues include low hardness, green color, waxy feel, and a white streak; avoid cutting unknown serpentinite dust because some varieties may contain fibrous asbestos minerals.
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