sedimentary

Jasper with Quartz Veining

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Dark reddish-brown to maroon with white-to-grey quartz veins; Luster: Dull to sub-vitreous; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.5-2.9

Hardness: 6
Color: Dark reddish-brown to maroon with white-to-grey quartz veins
Luster: Dull to sub-vitreous

Identified July 2, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from silica-rich sediments or volcanic ash that undergoes diagenesis. The quartz veins represent a secondary mineralization where hydrothermal fluids filled fractures in the already solidified stone.

Uses & applications

Used primarily for lapidary work, including tumbling, cabochons for jewelry, and as decorative gravel or pocket stones for collectors.

Geological facts

Jasper is an opaque variety of chalcedony. The reddish hues are typically caused by iron inclusions (hematite). This specific specimen shows multiple generations of fracture filling, creating the 'spiderweb' or veined appearance.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), opacity, and smooth, water-worn surface if found in riverbeds. Commonly found on beaches, in gravel pits, or stream beds throughout North America and Europe.

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