metamorphic
Mica Schist
Mica Schist (Quartz-Mica Metamorphic Rock)
Hardness: 3.5-5.5 on Mohs scale; Color: Golden-brown, yellowish-brown, bronze to silver; Luster: Pearly to sub-metallic, glittery; Foliation: High schistosity; Structure: Medium to coarse-grained platy mineral alignment.
- Hardness
- 3
- Color
- Golden-brown, yellowish-brown, bronze to silver
- Luster
- Pearly to sub-metallic, glittery
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Physical properties
Hardness: 3.5-5.5 on Mohs scale; Color: Golden-brown, yellowish-brown, bronze to silver; Luster: Pearly to sub-metallic, glittery; Foliation: High schistosity; Structure: Medium to coarse-grained platy mineral alignment.
Formation & geological history
Formed via regional metamorphism of shale, mudstone, or clay-rich sedimentary rocks under moderate temperatures and pressures, causing fine clays to recrystallize into coarse, shiny mica flakes.
Uses & applications
Used occasionally as decorative building stone, dimension stone, or landscaping rock. Collectible for its bright metallic sparkle.
Geological facts
The sparkling effect comes from fine alignment of biotite, muscovite, or phlogopite mica flakes, which reflect light along parallel foliation planes, giving it a glitter-like appearance.
Field identification & locations
Identified by its flaky, layered metamorphic structure (schistosity) and bright metallic glint. Commonly found in metamorphic terranes such as mountain belts around the world.
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