sedimentary

Jasper with Quartz inclusions

Silicon Dioxide (SiO2) with impurities

Hardness: 6.5-7 on the Mohs scale. Color: Red (hematite inclusions) and creamy white/yellow. Luster: Dull to vitreous. Crystal Structure: Trigonal/Microcrystalline. Cleavage: None (conchoidal fracture). Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Red (hematite inclusions) and creamy white/yellow
Luster: Dull to vitreous

Identified March 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the process of hydrothermal replacement or silicification within sedimentary or volcanic rock beds. The red coloring indicates iron oxide content. Most jasper formed during various geological eras, notably the Mesozoic and Cenozoic.

Uses & applications

Used primarily for lapidary work, jewelry (cabochons), interior decoration, and as a popular specimen for rock collectors and metaphysical use.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek 'iaspis', meaning 'spotted stone.' Many ancient civilizations used jasper for seals and amulets because of its durability.

Field identification & locations

Identify in the field by its waxy to dull luster, conchoidal fracture (curved breaks), and hardness (cannot be scratched by a steel knife). Commonly found in riverbeds or volcanic regions like those in the Western USA (Oregon, Idaho) and India.

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