sedimentary

Jasper (Red/Brown)

Microcrystalline Quartz (SiO2) with Iron Oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown, dark brown; Luster: Waxy to dull; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Reddish-brown, dark brown
Luster: Waxy to dull

Identified July 28, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown, dark brown; Luster: Waxy to dull; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Formation & geological history

Formed when microcrystalline silica precipitates in sedimentary or low-grade metamorphic environments, often with iron oxides providing the reddish-brown pigmentation. Typically rounded by stream or beach erosion.

Uses & applications

Used for lapidary arts, tumbled stones, jewelry beads, cabochons, and decorative rock collections.

Geological facts

Jasper has been used since antiquity for carving seals, ornaments, and amulets. It is an opaque variety of chalcedony.

Field identification & locations

Identified by its opacity, hardness (cannot be scratched by a steel nail), dull to waxy luster, and smooth rounded pebble form. Commonly found in riverbeds, gravel deposits, and beaches worldwide.