sedimentary
Jasper
Microcrystalline quartz (SiO2)
Hardness: 6.5 to 7 on the Mohs scale, Color: Various shades of brown, red, green, or yellow often with intricate banding, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None, Specific gravity: 2.58 to 2.91
- Hardness
- 6
Identified More sedimentary →
Explore Jasper in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5 to 7 on the Mohs scale, Color: Various shades of brown, red, green, or yellow often with intricate banding, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None, Specific gravity: 2.58 to 2.91
Formation & geological history
Forms through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry, highly valued by ancient civilizations including the Greeks, Romans, and Egyptians.
Field identification & locations
Identified by its conchoidal fracture, high hardness that scratches glass, and opaque nature. Commonly found in riverbeds, glacial deposits, and sedimentary rock formations worldwide.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary