sedimentary
Quartz Veined Siltstone
Siltstone with Quartz Intrusion (SiO2)
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
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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.
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