sedimentary
Yellow Jasper
Jasper (SiO2) with iron hydroxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- 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: Yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica from water solutions into cracks or cavities in other rocks. The yellow color is caused by the presence of Goethite or other iron hydroxide inclusions. Often found as water-worn pebbles in stream beds.
Uses & applications
Polished for use in jewelry (cabochons), carved into ornaments, and used in lithotherapy or crystal collecting.
Geological facts
Jasper has been used as a gemstone since antiquity; it was mentioned in the Bible and used in the seals of ancient civilizations. It is an opaque variety of chalcedony.
Field identification & locations
Identify by its opacity, hardness (cannot be scratched by a steel knife), and smooth, rounded water-worn shape. Commonly found in riverbeds, beaches, and desert areas worldwide.
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