metamorphic
Greenstone (likely serpentine-rich metamorphic rock)
Serpentinite, composed chiefly of serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄; identification from the image is tentative.
AI-generated identification · may be incorrectSmall, rough, mottled pale-to-dark green specimen with dark inclusions and a dull to slightly waxy surface. Serpentine minerals have Mohs hardness about 2.5–5 and a monoclinic or pseudohexagonal structure; the image does not establish exact hardness or cleavage.
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Physical properties
Small, rough, mottled pale-to-dark green specimen with dark inclusions and a dull to slightly waxy surface. Serpentine minerals have Mohs hardness about 2.5–5 and a monoclinic or pseudohexagonal structure; the image does not establish exact hardness or cleavage.
Formation & geological history
Typically forms when water alters magnesium-rich ultramafic rocks, often along tectonic plate boundaries; the age depends on the source rock and cannot be determined visually.
Uses & applications
Greenstone and serpentinite are used as decorative or carved stone, ornamental pieces, and sometimes in landscaping; this small rough piece is mainly a collector specimen.
Geological facts
“Greenstone” is a broad descriptive term, not a unique mineral or rock identification; similar-looking pieces may contain chlorite, epidote, or other green minerals.
Field identification & locations
Look for a green color and commonly waxy feel; hardness, streak, and mineral tests help distinguish serpentinite from jade or other green rocks. Serpentinite occurs in many mountain belts and ophiolite zones worldwide.
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