metamorphic
Polished green stone, likely serpentine
Serpentinite; chiefly antigorite/lizardite, Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectDark green to gray-green, fine-grained and waxy to subtly greasy luster, with pale veining; Mohs hardness about 2.5–4 and typically massive rather than visibly crystalline. The rounded, glossy surface indicates tumbling or polishing.
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Physical properties
Dark green to gray-green, fine-grained and waxy to subtly greasy luster, with pale veining; Mohs hardness about 2.5–4 and typically massive rather than visibly crystalline. The rounded, glossy surface indicates tumbling or polishing.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo low-temperature hydrothermal metamorphism and hydration, commonly in ophiolite belts; ages vary widely from Precambrian to modern tectonic settings.
Uses & applications
Used for carvings, ornamental stone, tumbled specimens, tiles, and limited architectural applications; attractive material may be sold as “serpentine jade,” though it is not true jade.
Geological facts
Serpentine-group minerals can contain minor magnetite, producing dark specks and occasional weak magnetism. Some serpentinite contains chrysotile asbestos, so avoid cutting or creating dust unless its composition is confirmed.
Field identification & locations
Identify by its green mottled appearance, low hardness, waxy feel, and inability to scratch glass; common sources include California, Italy, New Zealand, Canada, and Zimbabwe. Exact identification from the image is uncertain because other green rocks, such as nephrite or chlorite-rich stone, can look similar.
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