sedimentary

Jasper containing Agate (Jaspagate)

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Mottled red, brown, and green with waxy luster; Crystal Structure: Microcrystalline (trigonal); Specific Gravity: 2.6-2.9

Hardness: 6
Color: Mottled red, brown, and green with waxy luster

Identified June 8, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Mottled red, brown, and green with waxy luster; Crystal Structure: Microcrystalline (trigonal); Specific Gravity: 2.6-2.9

Formation & geological history

Formed from silica-rich groundwater filling cavities in volcanic or sedimentary rocks, often associated with iron oxidation which provides the reddish-brown hues. Most specimens are from the Phanerozoic eon.

Uses & applications

Commonly used in lapidary work for cabochons, beads, and tumbled stones. Occasional industrial use as a hard grinding medium.

Geological facts

Jasper is an opaque variety of chalcedony. When it mixed with translucent agate, it is colloquially known as 'Jaspagate'. The red color is typically due to inclusion of hematite.

Field identification & locations

Identify in the field by its waxy luster, smoothness when water-worn, and its inability to be scratched by a steel knife. Commonly found in riverbeds and gravel pits in volcanic regions.