metamorphic

Greenstone / River Jadeite pebble

Metavolcanic rock / Chlorite or Actinolite-rich schist

AI-generated identification · may be incorrect

Hardness: 5-6.5 Mohs (depending on mineralogy), Color: Dull to sage green with fine flecks, Luster: Waxy to dull, Texture: Fine-grained to micro-crystalline, Specific Gravity: 2.8-3.0

Hardness: 5-6

Identified July 4, 2026More metamorphic →

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Physical properties

Hardness: 5-6.5 Mohs (depending on mineralogy), Color: Dull to sage green with fine flecks, Luster: Waxy to dull, Texture: Fine-grained to micro-crystalline, Specific Gravity: 2.8-3.0

Formation & geological history

Formed via low-grade regional metamorphism of basaltic or oceanic crust rocks, often in subduction zones or mountain-building environments. This specimen appears water-worn into a river cobble.

Uses & applications

Informal landscaping, decorative gravel, historical tool making (celts/axes), or carving if of high enough mineral density.

Geological facts

Small green river rocks like this are often referred to as greenstone, a catch-all term for altered basic igneous rocks. They get their color primarily from the presence of chlorite, epidote, or actinolite minerals.

Field identification & locations

Identify by its olive-to-sage green hue and smooth, water-worn surface. Often found in riverbeds or coastal beaches in geologically active regions like the Pacific Northwest, New Zealand, or the Appalachians.