metamorphic
Greenstone, likely serpentine or green jasper
Serpentine-group minerals, chiefly antigorite/lizardite; possibly quartz-rich jasper
AI-generated identification · may be incorrectSmall tumbled, opaque to weakly translucent green pebble with a waxy surface and mottled pale-green color. Likely hardness about 2.5–5.5 Mohs, with no visible cleavage; exact properties require testing.
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Physical properties
Small tumbled, opaque to weakly translucent green pebble with a waxy surface and mottled pale-green color. Likely hardness about 2.5–5.5 Mohs, with no visible cleavage; exact properties require testing.
Formation & geological history
Serpentine forms when ultramafic mantle rocks hydrothermally alter, commonly during oceanic-crust or mountain-building processes; jasper forms from silica-rich chemical sediments. Geological age depends on locality and cannot be determined visually.
Uses & applications
Used as a decorative stone, carving material, lapidary cabochons, and inexpensive jewelry; serpentine is also used architecturally, though fibrous varieties may contain asbestos and require care.
Geological facts
“Greenstone” is a broad trade term, not a precise identification; similar pebbles may be jade, aventurine, prehnite, chrysoprase, or dyed material.
Field identification & locations
Check streak, hardness, density, and polish: serpentine is usually soft and waxy, while jade is tougher and denser; a quartz scratch test can help. Common sources include California, Italy, New Zealand, Canada, and New England.
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