sedimentary

Quartz-veined Sedimentary Rock

Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)

Hardness: Matrix 3-6 / Veins 7 (Mohs); Color: Tan/grey matrix with white veins; Luster: Dull to vitreous; Crystal structure: Microcrystalline; Cleavage: None/Conchoidal in veins; Specific gravity: ~2.65

Hardness: Matrix 3-6 / Veins 7 (Mohs)
Color: Tan/grey matrix with white veins
Luster: Dull to vitreous

Identified January 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of mineral particles or rock fragments (matrix), later fractured by tectonic stress. Hot, mineral-rich hydrothermal fluids then filled these cracks, precipitating silica to form white quartz veins.

Uses & applications

Primarily used as aggregate in construction, road base, and decorative landscaping. Some specimens are used in lapidary work as 'wishing stones'.

Geological facts

The appearance of a continuous line or 'belt' around a stone has led to cultural myths, such as 'wishing stones' where a circle of quartz is said to grant luck. These veins are geological records of the rock's stress history.

Field identification & locations

Identify by looking for distinct, protruding white lines (veins) that are harder than the surrounding host rock. Commonly found in riverbeds, glacial tills, and coastal beaches where water has polished the exterior.

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