sedimentary
Wishing Stone (Quartz-veined Siltstone or Graywacke)
Hydrothermal Quartz vein in matrix of SiO2 (Quartz) and Al2O3 (Clay minerals)
Hardness: 6-7 (Mohs scale); Color: Gray or brown matrix with distinct white or cream bands; Luster: Dull matrix, vitreous veins; Crystal Structure: Microcrystalline; Specific Gravity: 2.6-2.7
- Hardness
- 6-7 (Mohs scale)
- Color
- Gray or brown matrix with distinct white or cream bands
- Luster
- Dull matrix, vitreous veins
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Gray or brown matrix with distinct white or cream bands; Luster: Dull matrix, vitreous veins; Crystal Structure: Microcrystalline; Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the deposition of sediment in marine or fluvial environments, followed by tectonic stress creating fractures. Hydrothermal fluids rich in silica then filled these cracks, crystallizing into quartz veins. This specimen shows water-worn rounding from a river or beach.
Uses & applications
Used primarily in decorative landscaping, as pocket stones, or in coastal folk art/jewelry. Industrially, the parent rock is sometimes used as crushed stone/aggregate in construction.
Geological facts
In folklore, these are called 'Wishing Stones.' The legend states that if you find a stone with a single continuous white band circling it completely, you can make a wish. It is often believed that if you give the stone to someone else, your wish will come true.
Field identification & locations
Identify in the field by looking for smooth, water-rounded pebbles with high-contrast, protruding mineral lines. They are commonly found on rocky beaches (such as in New England or the UK) and in riverbeds where erosion has polished the surface to reveal the cross-cutting veins.
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