metamorphic
Greenschist
Chlorite schist
Hardness: 3.5-4.5; Color: Greenish-gray to olive green; Luster: Dull to pearly; Crystal structure: Foliated; Cleavage: Basal cleavage in schistose layers; Specific gravity: approx. 2.7-3.0
- Hardness
- 3
- Color
- Greenish-gray to olive green
- Luster
- Dull to pearly
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Physical properties
Hardness: 3.5-4.5; Color: Greenish-gray to olive green; Luster: Dull to pearly; Crystal structure: Foliated; Cleavage: Basal cleavage in schistose layers; Specific gravity: approx. 2.7-3.0
Formation & geological history
Formed through low-grade metamorphism of mafic igneous rocks (like basalt) or similar sedimentary rocks under low temperatures and pressures (greenschist facies).
Uses & applications
Commonly used as decorative stone, in construction as crushed stone, and sometimes for carvings or jewelry if high-quality chlorite proportions are present.
Geological facts
The characteristic green color is primarily due to the presence of minerals like chlorite, epidote, and actinolite. It often represents the metamorphic history of ancient sea floors.
Field identification & locations
Identify in the field by its distinct greenish hue, slab-like foliation, and tendency to split. Commonly found in orogenic belts and regions with old mountain ranges.
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