sedimentary

Quartz-veined Siltstone

Siltstone with Quartz (SiO2) veins

AI-generated identification · may be incorrect

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

Identified June 6, 2026More sedimentary →

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Physical properties

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.