metamorphic

Rounded greenstone pebble

Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing

AI-generated identification · may be incorrect

Olive-green, fine-grained, dull to weakly waxy luster, rounded and weathered surface with pits. Likely Mohs hardness 2.5–4; cleavage is not apparent and specific gravity is roughly 2.6–2.8.

Identified September 10, 2026More metamorphic →

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Physical properties

Olive-green, fine-grained, dull to weakly waxy luster, rounded and weathered surface with pits. Likely Mohs hardness 2.5–4; cleavage is not apparent and specific gravity is roughly 2.6–2.8.

Formation & geological history

Probably formed by low- to medium-grade metamorphism or hydrothermal alteration of ultramafic rock, then rounded by stream or beach transport. Such rocks commonly formed during ancient oceanic crust and mountain-building events.

Uses & applications

Suitable mainly as a collectible or decorative stone; serpentinite and related greenstones are sometimes used for carvings, tiles, countertops, and ornamental objects.

Geological facts

The green color commonly comes from serpentine, chlorite, epidote, or related iron- and magnesium-rich minerals. A definitive identification may require a streak, hardness, acid, magnetism, or thin-section test.

Field identification & locations

Common in serpentinite belts, ophiolites, and metamorphic terrains worldwide. Check for a pale-green streak, waxy feel, slick surfaces, and possible fibrous texture; avoid cutting unknown serpentinite because some varieties may contain asbestos minerals.