sedimentary
Sandstone with Quartz Vein
Arenite with Quartz (SiO2) Infilling
Hardness: 6-7 (Mohs scale), Color: tan to yellowish-brown with a white band, Luster: dull/earthy for matrix, silky/vitreous for the vein, Structure: clastic texture with a microcrystalline vein.
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan to yellowish-brown with a white band, Luster: dull/earthy for matrix, silky/vitreous for the vein, Structure: clastic texture with a microcrystalline vein.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains. The distinctive white band is a quartz vein formed when silica-rich hydrothermal fluids filled a fracture in the existing rock and crystallized over time.
Uses & applications
Used primarily as decorative landscaping stones, paperweights, or as educational specimens for demonstrating geological processes like fracture infilling.
Geological facts
Rocks with circular or straight 'wishing' bands/veins are often referred to as 'Wishing Stones' in folk traditions. The vein is significantly harder than the host rock, making it more resistant to erosion.
Field identification & locations
Identify in the field by looking for a distinct, continuous band of a different mineral (usually white quartz) wrapping around a water-worn, rounded pebble. Commonly found on beaches or in riverbeds.
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