metamorphic
Greenschist / Chloritaform Schist
Chlorite Schist (Group of Silicate Minerals)
Hardness: 3.5-4.5 on Mohs scale; Color: Dull grayish-green, olive, or brownish; Luster: Pearly to vitreous; Crystal Structure: Monoclinic with a foliated, platy texture; Cleavage: Perfect basal.
- Hardness
- 3
- Color
- Dull grayish-green, olive, or brownish
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 3.5-4.5 on Mohs scale; Color: Dull grayish-green, olive, or brownish; Luster: Pearly to vitreous; Crystal Structure: Monoclinic with a foliated, platy texture; Cleavage: Perfect basal.
Formation & geological history
Formed through regional metamorphism of mafic igneous rocks (like basalt) or clay-rich sediments under low-temperature, moderate-pressure conditions. Usually associated with tectonic plate boundaries.
Uses & applications
Commonly used as decorative stone in landscaping, flagstone for walkways, and occasionally for industrial fillers. Highly prized versions like Nephrite Jade-bearing schists are used in jewelry.
Geological facts
The green color comes from the presence of chlorite, epidote, or actinolite. These rocks define the 'Greenschist Facies' in geology, indicating specific pressure/temperature conditions during formation.
Field identification & locations
Identify it by its distinct 'schistosity' (layers), its greenish hue, and its tendency to flake or peel into thin, brittle layers. It is found globally in mountain ranges and metamorphic belts.
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