sedimentary
River Pebble (likely Quartzite or Chert)
Sedimentary Clast (Silicon Dioxide dominant)
Hardness: 6.5-7 on Mohs scale; Color: Tan to light brown with a white quartz vein; Luster: Matte to dull; Crystal structure: Cryptocrystalline; Shape: Rounded/water-worn clast.
- Hardness
- 6
- Color
- Tan to light brown with a white quartz vein
- Luster
- Matte to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Tan to light brown with a white quartz vein; Luster: Matte to dull; Crystal structure: Cryptocrystalline; Shape: Rounded/water-worn clast.
Formation & geological history
Formed through the erosion of larger rock formations, transported via water (rivers or streams) which rounded the specimen over time. The white line is a secondary quartz vein that filled a fracture in the host rock.
Uses & applications
Primarily used in landscaping, road base, or construction aggregate; sometimes collected as pocket stones or for tumble polishing.
Geological facts
The distinct white line is a vein formed when hydrothermal fluids rich in silica flows through cracks in the rock and crystallize. This specific specimen is known as a 'Wishing Stone' in some folk traditions due to the single continuous ring.
Field identification & locations
Identified by its smooth, water-worn texture and the presence of a distinct mineral vein. Common in riverbeds, glacial deposits, and beaches globally.
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