sedimentary
Red Jasper
Jasper (SiO2 with Fe2O3 inclusions)
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
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Physical properties
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
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.
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