metamorphic
Quartz-veined Schist (or Metasandstone)
Metamorphic Rock with Quartz Veining (SiO2)
Hardness: 7 (quartz veins) vs 3-5 (matrix); Color: Grey, green, and white; Luster: Vitreous to dull; Structure: Foliated or crystalline matrix with massive veins; Specific Gravity: 2.6-2.7
- Hardness
- 7 (quartz veins) vs 3-5 (matrix)
- Color
- Grey, green, and white
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (quartz veins) vs 3-5 (matrix); Color: Grey, green, and white; Luster: Vitreous to dull; Structure: Foliated or crystalline matrix with massive veins; Specific Gravity: 2.6-2.7
Formation & geological history
Formed through regional metamorphism where heat and pressure recrystallize sedimentary parent rocks. The white bands are quartz veins formed when silica-rich hydrothermal fluids filled fractures in the host rock during tectonic activity.
Uses & applications
Primarily used as decorative garden stones, aggregate, or for teaching geological principles like cross-cutting relationships. Rarely used in jewelry unless it contains precious inclusions.
Geological facts
Rocks with distinct white bands like this are often called 'Wishing Stones' in coastal folklore. If the white line forms a continuous circle around the stone, it is said to grant a wish.
Field identification & locations
Identify in the field by the distinct contrast between the light silica vein and the dark, often foliated host rock. Found globally in areas of ancient mountain building or glacial deposits. Collectors should look for symmetry in the bands.
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