metamorphic
Greenstone / Greenschist
Greenschist (metamorphosed mafic rock)
Hardness: 3.5-5 (Mohs scale); Color: Pale green to olive green; Luster: Dull to waxy; Texture: Fine-grained, slightly foliated; Composition: Chlorite, epidote, and actinolite.
- Hardness
- 3
- Color
- Pale green to olive green
- Luster
- Dull to waxy
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Physical properties
Hardness: 3.5-5 (Mohs scale); Color: Pale green to olive green; Luster: Dull to waxy; Texture: Fine-grained, slightly foliated; Composition: Chlorite, epidote, and actinolite.
Formation & geological history
Formed by low-grade regional metamorphism of mafic igneous rocks (like basalt) under high pressure and low temperature conditions, typical of subduction zones or mountain-building regions.
Uses & applications
Historically used for stone tools and carvings; currently used as construction aggregate, decorative landscaping stone, and occasionally in jewelry as 'river jade'.
Geological facts
Greenstone is often confused with jade by amateur collectors due to its color and toughness. It gets its green hue from the presence of chlorite and epidote minerals.
Field identification & locations
Identified by its distinct green color and hardness (softer than jadeite/nephrite). Commonly found in riverbeds and coastal areas near ancient tectonic plate boundaries.
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