metamorphic
Jasper-rich Quartzite with Quartz Veining
Silicon Dioxide (SiO2) with Ferric Oxide inclusions
Hardness: 6.5-7 Mohs. Color: Earthy reddish-brown, tan, and olive green with white quartz veins. Luster: Dull to sub-vitreous. Structure: Microcrystalline/Massive. Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Luster
- Dull to sub-vitreous
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Physical properties
Hardness: 6.5-7 Mohs. Color: Earthy reddish-brown, tan, and olive green with white quartz veins. Luster: Dull to sub-vitreous. Structure: Microcrystalline/Massive. Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone or chert. Over millions of years, heat and pressure fused grains together, while iron-rich fluids introduced reddish staining. The white lines are secondary quartz veins formed by hydrothermal activity filling cracks.
Uses & applications
Commonly used as decorative landscaping stone, in lapidary work for cabochons or tumbled stones, and as aggregate in construction.
Geological facts
The reddish-brown patterns are typical of 'Jasperized' materials, where iron oxides permeate the silica structure. Even though it is a common rock, every river-worn cobble like this has a unique fracture pattern telling the story of its transport.
Field identification & locations
Identify in the field by its high hardness (cannot be scratched by a steel knife) and its smooth, rounded river-worn texture. Look for the distinct cross-cutting white quartz veins and the variegated earthy colors.
