sedimentary
Jasper Pebble
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Red/brown with gray-tan matrix, Luster: Dull to waxy, Crystal structure: Microcrystalline (trigonal), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.91
- Hardness
- 6
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: Red/brown with gray-tan matrix, Luster: Dull to waxy, Crystal structure: Microcrystalline (trigonal), 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, typically during the Paleozoic or Mesozoic eras. The red coloration is due to iron (hematite) impurities.
Uses & applications
Used primarily as lapidary material, decorative stones in landscaping, and in jewelry as cabochons or tumbled stones. Also popular for meditation and crystal collections.
Geological facts
Jasper is an opaque variety of chalcedony. It has been used since antiquity for seals and ornamentation; the name comes from the Greek 'iaspis', meaning spotted stone.
Field identification & locations
Identify by its hardness (will scratch glass), opaque nature, and smooth, water-worn texture if found in riverbeds. Commonly found in gravel pits, river basins, and areas with ancient volcanic activity.
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