metamorphic
Greenschist (or Serpentinite) with Quartz-Feldspar Vein
Metabasalt / Greenschist Facies Rock
Hardness: 3.5-6 on Mohs scale depending on specific mineral mix. Color: Dusky greenish-grey body with a distinct whitish to pale pinkish mineral vein (quartz/feldspar). Luster: Dull to sub-vitreous. Cleavage: Foliated/schistose micro-cleavage or blocky fractures. Specific Gravity: ~2.7-3.0.
- Hardness
- 3
- Luster
- Dull to sub-vitreous
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Physical properties
Hardness: 3.5-6 on Mohs scale depending on specific mineral mix. Color: Dusky greenish-grey body with a distinct whitish to pale pinkish mineral vein (quartz/feldspar). Luster: Dull to sub-vitreous. Cleavage: Foliated/schistose micro-cleavage or blocky fractures. Specific Gravity: ~2.7-3.0.
Formation & geological history
Formed via low-grade regional metamorphism of mafic igneous rocks (such as basalt or gabbro) under moderate pressure and low to medium temperatures (greenschist facies). The cross-cutting vein formed later as hydrothermal fluid filled fractures in the rock.
Uses & applications
Used primarily as crushed stone, road base, river rock landscaping, and as a geological study specimen. Smooth river pebbles like this are popular among rock collectors.
Geological facts
Greenschist gets its characteristic greenish hue from chlorite, epidote, or actinolite minerals formed during metamorphism. Small hydrothermal veins of quartz or feldspar, like the one seen along the lower-left edge, are very common in metamorphic terrains.
Field identification & locations
Look for greenish-grey fine-grained matrix with low-grade metamorphic foliation, paired with cross-cutting white or pinkish quartz veins. Commonly found along riverbeds, gravel bars, and mountain streams draining metamorphic belts worldwide.
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