metamorphic
Greenstone / Greenschist
Greenschist (containing Chlorite, Epidote, Actinolite)
Hardness: 3.5-5.5 (varies by mineral content); Color: Dull to sage green with grayish hues; Luster: Pearly to vitreous or dull; Crystal Structure: Usually foliated or schistose texture; Cleavage: Good in one direction if mica-rich.
- Hardness
- 3
- Color
- Dull to sage green with grayish hues
- Luster
- Pearly to vitreous or dull
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Physical properties
Hardness: 3.5-5.5 (varies by mineral content); Color: Dull to sage green with grayish hues; Luster: Pearly to vitreous or dull; Crystal Structure: Usually foliated or schistose texture; Cleavage: Good in one direction if mica-rich.
Formation & geological history
Formed via regional metamorphism of mafic igneous rocks (like basalt) under low temperature and moderate pressure conditions, often in subduction zones or orogenic belts.
Uses & applications
Historically used for making stone tools (axes), occasionally used as decorative building stone, landscaping, or as a source of nephrite jade in specific geological contexts.
Geological facts
The name 'Greenschist' comes from the characteristic green minerals formed during metamorphism. It is a key indicator of low-grade metamorphic facies in Earth's crust.
Field identification & locations
Identify in the field by its distinctive green color and often platey, foliation-driven texture. Commonly found in coastal areas where metamorphic basement rocks are exposed or eroded as beach pebbles.
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