sedimentary
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
Hardness: 6-7 (veins), 4-5 (matrix); Color: Grey matrix with white/cream veins; Luster: Dull to earthy matrix, vitreous veins; Structure: Clastic matrix with crystalline infill; Specific Gravity: 2.6-2.8
- Hardness
- 6-7 (veins), 4-5 (matrix)
- Color
- Grey matrix with white/cream veins
- Luster
- Dull to earthy matrix, vitreous veins
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Physical properties
Hardness: 6-7 (veins), 4-5 (matrix); Color: Grey matrix with white/cream veins; Luster: Dull to earthy matrix, vitreous veins; Structure: Clastic matrix with crystalline infill; Specific Gravity: 2.6-2.8
Formation & geological history
Formed through the lithification of silt-sized particles in aqueous environments. The white veins are secondary hydrothermal quartz deposits where silica-rich fluids filled fractures within the rock after it consolidated.
Uses & applications
Primarily used as aggregate in road construction, landscaping decor, or as a river stone specimen for hobbyist collectors.
Geological facts
The 'staircase' or 'web' pattern of the veins is a result of structural stress on the rock over millions of years, creating cracks that allowed mineral-rich water to seep in and crystallize.
Field identification & locations
Identify by its matte, fine-grained texture contrasted against the hard, glass-like quartz veins. Commonly found in riverbeds, glacial tills, and coastal deposits where water has polished the surface.
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