sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron inclusions
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to brownish-yellow
- Luster
- Vitreous to waxy
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Yellow coloration is caused by the presence of iron oxide minerals like goethite.
Uses & applications
Used primarily for lapidary work, jewelry making (cabochons), pocket stones for meditation, and as an ornamental gemstone.
Geological facts
Jasper is an opaque variety of chalcedony. In ancient times, yellow jasper was often seen as a stone of protection and discernment, associated with the sun and the solar plexus chakra.
Field identification & locations
Identify in the field by its smooth, river-worn texture, high hardness (cannot be scratched by steel), and opaque nature. Commonly found in riverbeds and gravel deposits worldwide, including Africa, Brazil, and the USA.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary