metamorphic
Greenschist (Chlorite Schist)
Greenschist (containing Chlorite, Actinolite, and Epidote)
Hardness: 3.5-4.5 (Mohs), Color: Pale to medium green, Luster: Pearly to dull, Crystal structure: Foliated or schistose texture with fine-grained minerals, Cleavage: Basal cleavage in mica minerals, Specific Gravity: 2.8-3.0
- Hardness
- 3
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Physical properties
Hardness: 3.5-4.5 (Mohs), Color: Pale to medium green, Luster: Pearly to dull, Crystal structure: Foliated or schistose texture with fine-grained minerals, Cleavage: Basal cleavage in mica minerals, Specific Gravity: 2.8-3.0
Formation & geological history
Formed through the regional metamorphism of mafic igneous rocks (like basalt) under low temperature and moderate pressure conditions, typically in subduction zones or mountain-building regions.
Uses & applications
Used primarily as decorative stone, crushed stone for construction, and sometimes for landscaping or as a historical building material in localized regions.
Geological facts
The 'green' in greenschist comes from the presence of minerals like chlorite, epidote, and actinolite. It represents a specific 'facies' in geology that helps scientists determine the pressure and temperature history of a mountain range.
Field identification & locations
Look for a dull green color and a distinctly layered or flaky (foliated) texture that splits into thin sheets. It is commonly found in metamorphic terranes like the Appalachian Mountains or the Alps.
