sedimentary

Jasper

Microcrystalline Quartz (SiO2) with iron oxide impurities

Hardness: 6.5 to 7 on the Mohs scale. Color: Typically red, brown, yellow, or green due to various impurities. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz aggregate). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58 to 2.91.

Hardness: 6
Luster: Vitreous to dull

Identified August 3, 2026More sedimentary →

Explore Jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through the silification of sedimentary or volcanic rocks or through chemical precipitation in silica-rich aqueous environments, often associated with hydrothermal activity or ancient ocean basins. Geological age varies widely from Precambrian to Cenozoic.

Uses & applications

Used in ornamental carvings, cabochons for jewelry, decorative objects, and as a popular specimen for rock tumbling and lapidary arts.

Geological facts

Jasper has been used by ancient civilizations for thousands of years to create tools, seals, and talismans. Red jasper owes its distinct coloration to iron oxide inclusions.

Field identification & locations

Identified easily by its opaque nature, conchoidal fracture, and lack of cleavage combined with high hardness that scratches glass. Commonly found in riverbeds, mountainous regions, and areas with historic volcanic or sedimentary deposition worldwide.

Other sedimentary specimens

See all

Sandstone or Siltstone

Arenite (if sandstone)

Sedimentary

Quartz pebble

Silicon dioxide (SiO2)

sedimentary

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

fossil

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

sedimentary

Sedimentary Sandstone

Arenite (Sedimentary Rock)

sedimentary

Banded Siltstone / Mudstone Pebble

Siltstone / Argillite

sedimentary