metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite composition)
Platy or flaky texture (foliation), hardness of 2-3 on Mohs scale, silvery-gray to brownish-black color, vitreous to pearly luster, monoclinic crystal structure in mineral grains, specific gravity of 2.7-3.0
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Physical properties
Platy or flaky texture (foliation), hardness of 2-3 on Mohs scale, silvery-gray to brownish-black color, vitreous to pearly luster, monoclinic crystal structure in mineral grains, specific gravity of 2.7-3.0
Formation & geological history
Formed by the regional metamorphism of phyllite or mudstone under intermediate to high temperature and pressure. The high mica content gives it a characteristic sparkle or sheen.
Uses & applications
Primarily used as decorative stone in gardens, as a source for ground mica in industrial lubricants, and as a filler in paints or roof materials. It is generally too fragile for heavy construction.
Geological facts
The term 'schist' comes from the Greek word 'schizein', meaning 'to split', referring to how easily the rock breaks along its foliated planes. It is a key indicator of metamorphic grade in geology.
Field identification & locations
Identify in the field by its distinct parallel layering (schistosity) and 'sparkly' appearance when rotated in light. Found commonly in mountain belts and Precambrian shields worldwide.
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