sedimentary
Wishing Stone (Graywacke with Quartz Vein)
Graywacke (immature sandstone) with a SiO2 (Quartz) intrusion
Hardness: 6-7 Mohs; Color: Salt-and-pepper gray/green body with a distinct white band; Luster: Dull/Earthy; Crystal structure: Clastic (fine-grained matrix); Cleavage: None (conchoidal fracture).
- Hardness
- 6-7 Mohs
- Color
- Salt-and-pepper gray/green body with a distinct white band
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Salt-and-pepper gray/green body with a distinct white band; Luster: Dull/Earthy; Crystal structure: Clastic (fine-grained matrix); Cleavage: None (conchoidal fracture).
Formation & geological history
Formed from the rapid deposition of muddy sands in deep water environments (turbidity currents). The white line is a hydrothermal quartz vein formed later as silica-rich water filled a crack in the rock and solidified over millions of years.
Uses & applications
Commonly used in landscaping, road construction aggregate, and as a 'talisman' or 'wishing stone' in folk traditions and beachcombing circles.
Geological facts
In folklore, a stone with a single continuous white line encircling it completely is called a 'Wishing Stone.' It is believed that if you make a wish and throw it into the sea, or give it to someone else, the wish will come true.
Field identification & locations
Identify by looking for a dark, fine-grained river or beach stone that features a prominent, unbroken white stripe. They are ubiquitous on glacial beaches and in riverbeds across the Pacific Northwest, New England, and the UK.
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