metamorphic
Schist (Greenschist / Mica Schist)
Metamorphic rock rich in platy minerals (e.g., Chlorite/Mica schist)
Hardness: 3.5 to 5 on Mohs scale depending on mineral composition. Color: Greyish-green to dark greenish-grey with rusty weathering bands. Luster: Pearly to satiny metallic sheen along cleavage planes. Crystal Structure: Foliated with parallel alignment of platy minerals (schistosity).…
- Hardness
- 3
- Luster
- Pearly to satiny metallic sheen along cleavage planes
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Physical properties
Hardness: 3.5 to 5 on Mohs scale depending on mineral composition. Color: Greyish-green to dark greenish-grey with rusty weathering bands. Luster: Pearly to satiny metallic sheen along cleavage planes. Crystal Structure: Foliated with parallel alignment of platy minerals (schistosity). Cleavage: Distinct schistose cleavage causing it to split into rough layers. Specific Gravity: 2.7 to 3.0.
Formation & geological history
Formed through regional metamorphism of basaltic igneous rocks, shale, or mudstone under low-to-moderate temperature and high directed pressure. Often associated with mountain-building (orogenic) belts.
Uses & applications
Used occasionally as dimension stone, flagstone, decorative landscaping rock, and historical building material. Low industrial value due to schistosity making it weak for heavy construction aggregates.
Geological facts
Greenschist gets its greenish hue primarily from minerals like chlorite, epidote, and actinolite. The parallel arrangement of minerals creates a characteristic glittery appearance called schistosity.
Field identification & locations
Identified by visible aligned mineral grains (schistosity) creating a flaky or layered sheen that glistens in the light. Commonly found in metamorphic terrains worldwide, such as mountain roots and continental collision zones.
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