metamorphic
Schist with Quartz Vein
Mica Schist with SiO2 vein
Hardness: 2-3 (mica matrix) to 7 (vein); Color: Silver-grey with white banding; Luster: Pearly to sub-metallic on foliation planes; Structure: Foliated with visible mineral grains
- Hardness
- 2-3 (mica matrix) to 7 (vein)
- Color
- Silver-grey with white banding
- Luster
- Pearly to sub-metallic on foliation planes
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Physical properties
Hardness: 2-3 (mica matrix) to 7 (vein); Color: Silver-grey with white banding; Luster: Pearly to sub-metallic on foliation planes; Structure: Foliated with visible mineral grains
Formation & geological history
Formed through high-grade regional metamorphism of clay-rich sedimentary rocks (like shale or mudstone) under intense heat and pressure. The white vein formed later from hydrothermal fluids cooling in fractures.
Uses & applications
Used occasionally as decorative stone or in construction, though lacks structural strength for heavy loads; primarily of interest to collectors and for educational purposes.
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 divided into thin layers.
Field identification & locations
Identified by its sparkly, layered appearance (foliation) and the presence of a distinct, harder mineral vein cutting through the layers. Common in mountainous regions.
