sedimentary

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Deep red to reddish-brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58–2.91

Hardness: 6
Color: Deep red to reddish-brown
Luster: Vitreous to waxy

Identified June 28, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Deep red to reddish-brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58–2.91

Formation & geological history

Formed from silica-rich groundwater that solidifies into microcrystalline quartz, with the red color caused by iron or hematite inclusions. Typically found in sedimentary beds or as nodules in volcanic rocks.

Uses & applications

Used primarily for jewelry, lapidary art, ornaments, and as a decorative stone in landscaping. Historically used for making tools and seals.

Geological facts

Red jasper was a favorite gem in the ancient world; in Egyptian culture, it was associated with the blood of Isis and often carved into protective amulets.

Field identification & locations

Identifiable by its opaque red color, conchoidal fracture when broken, and extreme hardness (cannot be scratched by a steel knife). Common in dry riverbeds and ancient volcanic regions.