metamorphic
Mica Schist with Garnet
Garnet-Mica Schist
Hardness: 6.5-7.5 (garnets) / 2-3 (mica matrix); Color: silvery-gray to brownish with dark red inclusions; Luster: Pearly to metallic; Structure: Foliated with flaky mica layers and isometric garnets.
- Hardness
- 6
- Color
- silvery-gray to brownish with dark red inclusions
- Luster
- Pearly to metallic
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Physical properties
Hardness: 6.5-7.5 (garnets) / 2-3 (mica matrix); Color: silvery-gray to brownish with dark red inclusions; Luster: Pearly to metallic; Structure: Foliated with flaky mica layers and isometric garnets.
Formation & geological history
Formed through regional metamorphism of shale or mudstone under high pressure and temperature conditions, typically during mountain-building events (orogeny).
Uses & applications
Primarily used as a decorative stone, in construction as fill or flagstone, and as a source for industrial abrasives from the garnet content.
Geological facts
The term 'schist' comes from the Greek word 'schizein' meaning 'to split,' referring to how easily the rock cleaves along the planes of the mica minerals.
Field identification & locations
Identified by its shiny, layered appearance (schistosity) and the presence of 'almandine' garnets as crystalline nodules. Found in metamorphic belts globally.
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