metamorphic

Green Schist

Greenschist (Chlorite Schist)

AI-generated identification · may be incorrect

Mohs hardness: 2-3.5; Color: dull green to bright green; Luster: Pearly to dull; Crystal structure: Monoclinic (microscopic); Cleavage: Perfect basal (fissile foliation); Specific gravity: 2.7-3.0.

Hardness: 2-3
Color: dull green to bright green
Luster: Pearly to dull

Identified July 16, 2026More metamorphic →

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Physical properties

Mohs hardness: 2-3.5; Color: dull green to bright green; Luster: Pearly to dull; Crystal structure: Monoclinic (microscopic); Cleavage: Perfect basal (fissile foliation); Specific gravity: 2.7-3.0.

Formation & geological history

Formed by regional metamorphism of mafic igneous rocks (like basalt) under low temperature and moderate pressure conditions, typically during tectonic plate collisions.

Uses & applications

Used occasionally as decorative stone, in landscaping, and sometimes as a minor source of metals if containing mineral veins; primarily of interest to geological collectors.

Geological facts

Greenschist facies define a specific grade of metamorphism. The green color is primarily due to the presence of chlorite, epidote, or actinolite minerals.

Field identification & locations

Identified in the field by its distinct green hue and strongly foliated, plate-like alignment of minerals which allows it to split easily. Common in orogenic belts like the Appalachians or the Alps.