metamorphic
Muscovite Schist with Muscovite Mica
Muscovite-rich Schist (KAl2(AlSi3O10)(OH)2)
Hardness: 2-2.5 (mica sheets), 6-7 (overall rock); Color: Silvery-gray to golden-brown; Luster: Pearly to metallic; Structure: Foliated with prominent 'micaceous' sheen; Cleavage: Perfect basal cleavage in mica flakes.
- Hardness
- 2-2
- Color
- Silvery-gray to golden-brown
- Luster
- Pearly to metallic
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Physical properties
Hardness: 2-2.5 (mica sheets), 6-7 (overall rock); Color: Silvery-gray to golden-brown; Luster: Pearly to metallic; Structure: Foliated with prominent 'micaceous' sheen; Cleavage: Perfect basal cleavage in mica flakes.
Formation & geological history
Formed from the regional metamorphism of shale or pelitic rocks under medium-grade pressure and temperature conditions. Typically associated with mountain-building events.
Uses & applications
Source of mica for electrical insulation, pearlescent pigment in cosmetics/paints, and used in building stone or specialized high-temperature windows.
Geological facts
Mica sheets were once used for the windows of wood-burning stoves and ovens because they are transparent and heat-resistant, earning the name 'Muscovy Glass'.
Field identification & locations
Identify by its 'sparkly' or glittery appearance due to parallel alignment of mica flakes. Found globally in metamorphic belts like the Appalachians or Himalayas.
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