metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Silvery-gray, brownish, or golden; Luster: Pearly to metallic (silky); Structure: Foliated with large mica flakes; Cleavage: Perfect in one direction (micaceous); Specific Gravity: 2.7-2.8
- Hardness
- 3
- Color
- Silvery-gray, brownish, or golden
- Luster
- Pearly to metallic (silky)
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Physical properties
Hardness: 3.5-4; Color: Silvery-gray, brownish, or golden; Luster: Pearly to metallic (silky); Structure: Foliated with large mica flakes; Cleavage: Perfect in one direction (micaceous); Specific Gravity: 2.7-2.8
Formation & geological history
Formed through the regional metamorphism of shale, mudstone, or igneous rocks under intermediate-grade temperatures and pressures. Most common in mountain belts and Precambrian shields.
Uses & applications
Used as a decorative stone in garden design, flagstone for walkways, and historically for roofing or foundation stones due to its ability to split into slabs.
Geological facts
The word schist comes from the Greek 'schizein,' meaning 'to split,' referring to its characteristic foliation. It is the bridge between phyllite and gneiss in the metamorphic sequence.
Field identification & locations
Identify in the field by its distinct 'schistosity'—a sparkly, layered texture where mineral grains (usually mica) are visible to the naked eye. Found globally in ancient tectonic zones like the Appalachians or Alps.
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