metamorphic
Schist
Schist
Hardness: 3.5-4; Color: Silvery-gray to dark green; Luster: Sub-metallic to vitreous; Structure: Foliated with large, platy, visible mineral grains; Cleavage: Excellent in one direction (schistosity).
- Hardness
- 3
- Color
- Silvery-gray to dark green
- Luster
- Sub-metallic to vitreous
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Physical properties
Hardness: 3.5-4; Color: Silvery-gray to dark green; Luster: Sub-metallic to vitreous; Structure: Foliated with large, platy, visible mineral grains; Cleavage: Excellent in one direction (schistosity).
Formation & geological history
Forms through medium-grade regional metamorphism of shale or mudstone. Subjected to high temperatures and pressures that cause platy minerals like mica to align. Found in many Precambrian and Paleozoic mountain belts.
Uses & applications
Used as a decorative stone for walls and flooring, as landscaping markers, and historically as a local building material.
Geological facts
The term 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to the ease with which the rock can be split into layers. It represents an intermediate stage between phyllite and gneiss.
Field identification & locations
Identified by its distinctive sparkly or 'glittery' appearance due to high mica content and its wavy, foliated texture. Common in Appalachian and Rocky Mountain orogenic belts.
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