metamorphic
Wishing Stone (Quartz-veined Metamorphic/Sedimentary Rock)
Quartz Vein in Greywacke/Slate (SiO2 in host rock)
Hardness: Quartz vein 7, Host rock 3.5-5.5; Color: Grey to dark slate host rock with a distinct continuous white to off-white quartz band running around it; Luster: Vitreous quartz band, dull/earthy host rock; Cleavage: Quartz lacks cleavage (conchoidal fracture), host rock has planar slaty cleavage or fine grain.
- Hardness
- Quartz vein 7, Host rock 3
- Luster
- Vitreous quartz band, dull/earthy host rock
Identified More metamorphic →
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Physical properties
Hardness: Quartz vein 7, Host rock 3.5-5.5; Color: Grey to dark slate host rock with a distinct continuous white to off-white quartz band running around it; Luster: Vitreous quartz band, dull/earthy host rock; Cleavage: Quartz lacks cleavage (conchoidal fracture), host rock has planar slaty cleavage or fine grain.
Formation & geological history
Formed when fluid rich in silica (silicon dioxide) penetrated fractures within host metamorphic or sedimentary rocks (such as slate, shale, or greywacke) under high heat and pressure. As the fluids cooled, quartz crystallized into a vein, which was later eroded into a smooth pebble by water action.
Uses & applications
Popular as lucky pocket stones, decorative garden river rocks, and novelty items for rock collectors.
Geological facts
In folklore, a 'Wishing Stone' is a rock with a single continuous white band going all the way around without interruption. Legend holds that if you trace your finger around the white line while making a wish, or throw it into water, your wish will come true.
Field identification & locations
Look for a smooth, water-worn pebble featuring a distinct white quartz vein forming an unbroken loop around the dark host rock. Common in glacial deposits, gravel bars, and river beds worldwide.
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