sedimentary

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Deep reddish-brown (from iron inclusions) with white to light-gray quartz veins; Luster: Dull to waxy when unpolished; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Luster: Dull to waxy when unpolished

Identified March 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into sediment or volcanic ash. The red color suggests the presence of iron oxide (hematite). The veins indicate subsequent brittle fracturing where secondary quartz precipitated into cracks. Common in Precambrian and Paleozoic age deposits.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons, beads), decorative ornaments, and as a popular specimen for rock tumbling and collecting.

Geological facts

In antiquity, red jasper was known as the 'rain-bringer' and was believed to drive away evil spirits. The white veins are often called 'quartz stringers' and are the result of tectonic stress that cracked the stone while it was underground.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel knife), smooth water-worn texture on beaches/riverbeds, and the presence of intersecting mineral veins. Commonly found on coastlines, particularly in areas like the Pacific Northwest or the Great Lakes.