metamorphic
Green Schist
Greenschist (composed of chlorite, epidote, and actinolite)
Hardness: 3.5-4.5 (Mohs scale); Color: green to dark green with possible black banding; Luster: vitreous to pearly; Crystal structure: monoclinic (in constituent minerals); Cleavage: excellent basal cleavage in chlorite; Specific gravity: 2.8-3.0.
- Hardness
- 3
- Color
- green to dark green with possible black banding
- Luster
- vitreous to pearly
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Physical properties
Hardness: 3.5-4.5 (Mohs scale); Color: green to dark green with possible black banding; Luster: vitreous to pearly; Crystal structure: monoclinic (in constituent minerals); Cleavage: excellent basal cleavage in chlorite; Specific gravity: 2.8-3.0.
Formation & geological history
Formed through low-temperature, high-pressure regional metamorphism of mafic igneous rocks (like basalt) or volcanic sediment. Typically associated with mountain-building events and subduction zones.
Uses & applications
Used primarily as decorative stone, in landscaping, and architectural veneers. Historically used for making stone tools or carving ornaments.
Geological facts
The characteristic green color is primarily due to the presence of chlorite and epidote minerals. It represents the 'Greenschist Facies' in metamorphic grading, indicating specific pressure and temperature conditions during formation.
Field identification & locations
Identify by its distinctive flaky or 'foliated' texture and characteristic dull green hue. It often splits into thin sheets. Commonly found in metamorphic belts such as the Appalachian Mountains or the Alps.
