metamorphic
Weathered greenish-gray stone, likely serpentinite
Serpentinite (serpentine-group minerals, chiefly antigorite/lizardite; approximate formula Mg₃Si₂O₅(OH)₄)
AI-generated identification · may be incorrectTypically Mohs 2.5–4, waxy to dull luster, green-gray color, fine-grained and massive; commonly shows slick, smooth weathering and dark veins. The image is insufficient for confident mineral identification.
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Physical properties
Typically Mohs 2.5–4, waxy to dull luster, green-gray color, fine-grained and massive; commonly shows slick, smooth weathering and dark veins. The image is insufficient for confident mineral identification.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite hydrate during hydrothermal alteration, commonly along oceanic crust and tectonic plate boundaries. Ages vary from ancient Precambrian bodies to active settings.
Uses & applications
Used as decorative stone, carvings, countertops, and historically as a source of ornamental material; not generally valuable as a small unverified hand specimen.
Geological facts
Serpentinite often contains magnetite and may be weakly magnetic; some occurrences are associated with asbestos-forming minerals, so avoid cutting or generating dust until tested.
Field identification & locations
The olive-green color, soft-looking waxy surface, and dark veining are suggestive, but alternatives include altered basalt, greenstone, or weathered slag. Common sources include California, Italy, New Zealand, and mountain belts worldwide.
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