sedimentary

Quartz Veined Siltstone

Siltstone with Quartz Intrusion (SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (quartz vein) vs 3-4 (siltstone matrix); Color: Grey with white bands; Luster: Dull matrix with vitreous bands; Texture: Fine-grained, smooth water-worn surface.

Hardness: 6-7 (quartz vein) vs 3-4 (siltstone matrix)
Color: Grey with white bands
Luster: Dull matrix with vitreous bands

Identified July 5, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (quartz vein) vs 3-4 (siltstone matrix); Color: Grey with white bands; Luster: Dull matrix with vitreous bands; Texture: Fine-grained, smooth water-worn surface.

Formation & geological history

Formed from the lithification of silt-sized particles. The white bands are quartz veins created when hydrothermal fluids filled cracks in the host rock and crystallized over millions of years. This specimen was likely smoothed by fluvial or glacial action.

Uses & applications

Primarily uses are decorative as river rocks, landscaping, or as garden stones. Siltstone itself can be used in construction filler or flagstone in larger formats.

Geological facts

These are often called 'Wishing Stones' if the white band makes a complete continuous circle around the rock. They are classic examples of structural geology showing brittle fracturing followed by mineral precipitation.

Field identification & locations

Identify by the distinct contrast between the dark, fine-grained host rock and the hard, crystalline white bands. Found commonly in riverbeds and on beaches worldwide.