metamorphic
Schist
Lepidoblastic Mica Schist
Hardness: 3.5-4; Color: Silver, gray, or blue-gray with a metallic sheen; Luster: Pearly to sub-metallic; Crystal structure: Foliated (schistosity); Cleavage: Excellent in one direction; Specific gravity: 2.7-2.8
- Hardness
- 3
- Color
- Silver, gray, or blue-gray with a metallic sheen
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4; Color: Silver, gray, or blue-gray with a metallic sheen; Luster: Pearly to sub-metallic; Crystal structure: Foliated (schistosity); Cleavage: Excellent in one direction; Specific gravity: 2.7-2.8
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under high temperature and pressure. It undergoes significant recrystallization, typically during mountain-building events (orogenies).
Uses & applications
Used historically as a building material, for paving stones, and as a decorative stone in gardens. Some varieties are used as an abrasive or as host rocks for precious gemstones like garnets.
Geological facts
The word schist is derived from the Greek word 'schizein', meaning 'to split', referring to how easily the rock can be flaked into thin layers along its mica planes.
Field identification & locations
Identify by its 'schistose' texture, where flat, platy mineral grains (mica) are visible to the naked eye and aligned in a wavy, parallel fashion. Found commonly in the Appalachian Mountains, Alps, and Himalayas.
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