sedimentary

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Reddish-brown (iron inclusions) with white/translucent quartz, Luster: Dull to waxy, Crystal Structure: Hexagonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91

Hardness: 6

Identified March 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the process of silica-rich fluids permeating volcanic ash or sedimentary beds (silicification). The white quartz veins indicate later stage hydrothermal activity where mineral-rich water filled fractures in the existing jasper. Can range from Precambrian to recent geological ages.

Uses & applications

Used primarily in lapidary work for cabochons, beads, and decorative carvings. Historically used for making tools due to its sharp conchoidal fracture. Also popular as a landscape stone or for mineral collectors.

Geological facts

Jasper is an opaque variety of chalcedony. The red color in this specimen is caused by iron(III) oxide (hematite) impurities. It has been used by humans for thousands of years, prominently featured in ancient cylinder seals and jewelry from Mesopotamia.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel knife), smooth waxy feel on breaks, and lack of transparency. Commonly found in riverbeds, deserts, or near volcanic deposits. Notable locations include the Western USA, Brazil, and India.