metamorphic
Schist
Crystalline Metamorphic Rock (Schist)
Hardness: 3.5-5 (variable); Color: Grey, greenish-grey, or silvery; Luster: Pearly to sub-metallic due to mica; Structure: Foliated (schistosity), showing distinct layering or banding; Specific Gravity: 2.7-2.8
- Hardness
- 3
- Color
- Grey, greenish-grey, or silvery
- Luster
- Pearly to sub-metallic due to mica
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Physical properties
Hardness: 3.5-5 (variable); Color: Grey, greenish-grey, or silvery; Luster: Pearly to sub-metallic due to mica; Structure: Foliated (schistosity), showing distinct layering or banding; Specific Gravity: 2.7-2.8
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high pressure and temperature conditions. It typically dates to various geological eras depending on regional mountain-building events.
Uses & applications
Used historically as a building stone (flagstone), for decorative garden walls, and occasionally in artistic carvings. It is not generally high in industrial value compared to marble or granite.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to the ease with which these rocks can be split along their planes of foliation. Many schists contain larger crystals called porphyroblasts, such as garnets.
Field identification & locations
Identify by looking for 'schistosity'—pronounced layering with mica flakes that catch the light. Look for it in metamorphic belts and mountain ranges. This specific specimen appears to be water-worn, likely found in a river or coastal environment.
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