metamorphic
Greenstone or Chlorite Schist
Greenschist / Chlorite schist
Hardness: typically 2-4 (Mohs), depending on exact composition. Color: grayish green to dark green. Luster: dull to slightly silky or pearly due to micaceous minerals. Crystal structure: foliated (schistose) or massive. Cleavage: excellent in one direction if schistose.
- Hardness
- typically 2-4 (Mohs), depending on exact composition
- Color
- grayish green to dark green
- Luster
- dull to slightly silky or pearly due to micaceous minerals
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Physical properties
Hardness: typically 2-4 (Mohs), depending on exact composition. Color: grayish green to dark green. Luster: dull to slightly silky or pearly due to micaceous minerals. Crystal structure: foliated (schistose) or massive. Cleavage: excellent in one direction if schistose.
Formation & geological history
Formed through low-grade regional metamorphism of mafic igneous rocks (like basalt) or clay-rich sediments. Typically contains chlorite, epidote, and actinolite which impart the green color.
Uses & applications
Often used as aggregate, decorative stone, or for landscaping. Rarely used for structural purposes due to foliation.
Geological facts
Greenstone belts are often associated with ancient Archean cratons and can host significant gold and base metal deposits along shear zones.
Field identification & locations
Identified by its greenish color, foliation (layered structure), and relatively soft nature. Commonly found in areas of ancient mountain building and continental shields.
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