sedimentary
Yellow Jasper
Silicon Dioxide (SiO2)
Hardness: 6.5-7.0 (Mohs scale); Color: Yellow to mustard-gold; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Yellow to mustard-gold
- Luster
- Vitreous to dull
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Yellow to mustard-gold; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific gravity: 2.6-2.9.
Formation & geological history
Formed through the deposition of silica from water or volcanic ash, typically in sedimentary environments where iron oxides provide the yellow coloration. Most jasper deposits are millions of years old.
Uses & applications
Used primarily in lapidary arts, jewelry (cabochons), interior decoration, and as a collector's stone or metaphysical pocket stone.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. It was highly prized in the ancient world for its supposed protective powers.
Field identification & locations
Identify in the field by its opacity, smooth water-worn surface (if found in rivers), and its ability to scratch glass. Commonly found in riverbeds, or areas with volcanic sedimentary history like the USA, Brazil, and India.
More like this
Other sedimentary specimens
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