metamorphic
Mica Schist with Quartz
Mica-Quartz Schist (Muscovite subclass)
Hardness: 2-3 (mica) and 7 (quartz), Color: Silvery-gray with white inclusions, Luster: Pearly to sub-metallic (mica) and vitreous (quartz), Crystal Structure: Monoclinic/Hexagonal, Cleavage: Perfect basal (mica)
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Physical properties
Hardness: 2-3 (mica) and 7 (quartz), Color: Silvery-gray with white inclusions, Luster: Pearly to sub-metallic (mica) and vitreous (quartz), Crystal Structure: Monoclinic/Hexagonal, Cleavage: Perfect basal (mica)
Formation & geological history
Formed through high-grade regional metamorphism of clay-rich sedimentary rocks (shales) under high temperature and pressure environments. Common in orogenic belts (mountain-building zones).
Uses & applications
Primarily used as a decorative stone, in construction aggregates, and as a source for ground mica used in paints, cosmetics, and electrical insulation.
Geological facts
The 'shiny' effect is caused by muscovite mica flakes reflecting light. This specimen shows a transition where quartz veins have intruded or segregated during the metamorphic process.
Field identification & locations
Identify by its 'schistosity' (pronounced layering/alignment of minerals) and intense sparkle when rotated in light. Found in metamorphic terrains like the Appalachians or the Alps.
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