metamorphic
Mica Schist with Quartz
Schist containing Muscovite and Quartz
Hardness: 2.5-3.5 (mica) to 7 (quartz); Color: Silvery-gray, brownish, containing shiny flakes; Luster: Pearly to vitreous; Structure: Foliated with visible mineral layers; Cleavage: Perfect basal cleavage in the mica flakes.
- Hardness
- 2
- Color
- Silvery-gray, brownish, containing shiny flakes
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2.5-3.5 (mica) to 7 (quartz); Color: Silvery-gray, brownish, containing shiny flakes; Luster: Pearly to vitreous; Structure: Foliated with visible mineral layers; Cleavage: Perfect basal cleavage in the mica flakes.
Formation & geological history
Formed through the regional metamorphism of clay-rich sedimentary rocks (shale) under intermediate temperature and pressure. Large mica crystals grow perpendicular to the direction of pressure, creating a foliated 'schistose' texture.
Uses & applications
Primarily used for geological study, landscaping stone, and occasionally as a filler or facing stone in construction. Mica itself is used in electronics and cosmetics.
Geological facts
The word 'schist' is derived from a Greek word meaning 'to split,' referring to the ease with which the rock can be divided along its flakes. The shiny flakes are often mistaken for silver or gold by novice collectors.
Field identification & locations
Identify by looking for a 'glittery' appearance caused by large muscovite flakes and a layered, foliated texture. It is common in mountainous regions and metamorphic belts worldwide, such as the Appalachians or the Alps.
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