sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
AI-generated identification · may be incorrectHardness: 6.5–7 (Mohs scale), Color: Green and brown bands/mottling, Luster: Vitreous to waxy, Crystal Structure: Microcrystalline (Trigonal), Cleavage: None, Specific Gravity: 2.58–2.91
- Hardness
- 6
Identified More sedimentary →
Explore Jasper in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5–7 (Mohs scale), Color: Green and brown bands/mottling, Luster: Vitreous to waxy, Crystal Structure: Microcrystalline (Trigonal), Cleavage: None, Specific Gravity: 2.58–2.91
Formation & geological history
Formed through the accumulation of fine silica-rich sediments or volcanic ash that undergoes lithification. This specimen likely formed in an environment with fluctuating mineral content, causing the layered or banded appearance.
Uses & applications
Commonly used for decorative ornaments, lapidary work (tumbling/polishing), jewelry (cabochons), and as a collector's specimen.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Old French 'jaspre', meaning 'spotted or speckled stone'. It has been used as a gemstone since antiquity.
Field identification & locations
Identify in the field by its hardness (will scratch glass), opaque nature, and smooth, conchoidal fracture. Often found as rounded river stones or in desert washes.
More like this
Other sedimentary specimens
Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary