sedimentary

Jasper (Red Jasper with Quartz veins)

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5–7 (Mohs scale), Color: Deep red/brown with white-grey quartz veining, Luster: Dull to waxy when raw, Crystal structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.58–2.91

Hardness: 6

Identified March 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich solutions into volcanic ash or fine-grained sediments during diagenesis. The red color is caused by iron oxide (hematite) inclusions. Many samples date back to the Proterozoic or Paleozoic eras.

Uses & applications

Commonly used in lapidary work for cabochons, beads, and polished palm stones. Used as an ornamental stone in interior design and is a popular entry-level collector specimen. Historically used for seals and amulets.

Geological facts

Jasper is an opaque variety of chalcedony. In ancient times, it was known as the 'supreme nurturer.' The white veins in this specimen are secondary quartz deposits that filled cracks in the jasper host rock through hydrothermal activity.

Field identification & locations

Identify in the field by its opaque nature (it does not let light through even at the edges), its typical red-brick color, and its inability to be scratched by a steel knife. Frequently found in riverbeds, glacial till, and coastal areas.

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