sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)

Hardness: 6.5-7 on Mohs scale; Color: Yellow, mustard, or ochre; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal) microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Yellow, mustard, or ochre
Luster: Vitreous to waxy

Identified March 14, 2026More sedimentary →

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 deposition of silica-rich fluids in volcanic ash or sedimentary environments. Its yellow color comes from the inclusion of iron oxides. It can be found in strata ranging from Precambrian to recent geological ages.

Uses & applications

Used primarily as a decorative gemstone, for cabochons in jewelry, carvings, and as a healing stone in metaphysical practices. Historically used for making tools due to its sharp conchoidal fracture.

Geological facts

Jasper is an opaque, impure variety of silica. The name 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone'. It is known as a stone of protection and endurance in various historical cultures.

Field identification & locations

Identify in the field by its opacity (unlike translucent agate), mustard-yellow color, and smooth, waxy feel when polished. Commonly found in riverbeds and desert environments in areas like India, Russia, Brazil, and the USA (Oregon/Idaho).

Other sedimentary specimens

See all

Sandstone or Siltstone

Arenite (if sandstone)

Sedimentary

Sandstone

Arenite (primarily SiO2)

sedimentary

Shale or Slaty Mudstone

Argillaceous sedimentary rock

sedimentary

Chert Breccia

Brecciated Chert (Microcrystalline Silica)

sedimentary

Sandstone (Quartz-rich)

Arenite (SiO2)

sedimentary

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

sedimentary