sedimentary

Quartz-veined Siltstone

Siltstone with Quartz (SiO2) veins

AI-generated identification · may be incorrect

Hardness: 6-7 (veins), 4-5 (matrix); Color: Brownish-grey matrix with white/translucent veins; Luster: Dull to vitreous; Structure: Fine-grained sedimentary layering with secondary crystalline infill; Specific Gravity: 2.6-2.7

Hardness: 6-7 (veins), 4-5 (matrix)
Color: Brownish-grey matrix with white/translucent veins
Luster: Dull to vitreous

Identified May 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the lithification of silt-sized particles in a low-energy aquatic environment. The prominent white veins formed later when tectonic stress cracked the rock, allowing silica-rich hydrothermal fluids to precipitate quartz within the fractures.

Uses & applications

Primarily used as a decorative garden stone or 'river rock.' Larger deposits may be used as fill material or road base in construction.

Geological facts

The 'criss-cross' pattern of veins often creates a 'septarian-like' appearance, though it is the result of structural fracturing (brittle deformation) rather than shrinking cores. These are common in riverbeds where water erosion polishes the surface to reveal the internal vein structure.

Field identification & locations

Identify by looking for fine sedimentary layers interrupted by hard, crystalline white bands that stand out in relief. Commonly found in riverbeds, glacial tills, and coastal outcrops. Collectors look for unique vein geometries.