metamorphic
Mica Schist
Mica Schist (predominantly Muscovite or Biotite series)
Hardness: 2-2.5 for mica flakes, 6-7 for overall rock; Color: Silvery-grey to brownish-gold; Luster: Pearly to sub-metallic; Crystal Structure: Monoclinic flakes; Cleavage: Perfect basal cleavage in mica components.
- Hardness
- 2-2
- Color
- Silvery-grey to brownish-gold
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 2-2.5 for mica flakes, 6-7 for overall rock; Color: Silvery-grey to brownish-gold; Luster: Pearly to sub-metallic; Crystal Structure: Monoclinic flakes; Cleavage: Perfect basal cleavage in mica components.
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high temperature and pressure. The alignment of mica flakes creates a characteristic foliation known as schistosity.
Uses & applications
Used occasionally as decorative stone in construction, garden paths, and as a source of ground mica for industrial lubricants, electronics, and cosmetics.
Geological facts
The word schist is derived from the Greek word 'schizein', which means 'to split', referring to the ease with which the rock can be split into thin layers along the mica planes.
Field identification & locations
Identify in the field by its distinct 'shimmer' or 'sparkle' when rotated in sunlight. It is commonly found in mountain belts and metamorphic terrains. Collectors look for accessory minerals like garnets often embedded within.
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