sedimentary

Red Jasper

Jasper (SiO2 with Fe2O3 inclusions)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Deep Brick Red to Reddish-Brown; Luster: Dull to Vitreous; Crystal Structure: Microcrystalline/Cryptocrystalline (Hexagonal); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Deep Brick Red to Reddish-Brown
Luster: Dull to Vitreous

Identified May 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water solutions or volcanic ash, occurring in hydrothermally altered environments or as part of banded iron formations. It can date from almost any geological age.

Uses & applications

Used primarily in lapidary arts for jewelry, beads, and cabochons. Historically used for making tools and seals, and currently popular for decorative ornamental stones.

Geological facts

The red color is caused by iron (Hematite) inclusions. It was known as the 'rain bringer' in some Native American traditions and has been used by many ancient civilizations for protective amulets.

Field identification & locations

Identify in the field by its opaque red color, smooth waxy texture when wet, and conchoidal (shell-like) fracture. Commonly found in riverbeds or beaches where silica-rich rocks erode. It will not be scratched by a steel knife.