sedimentary
Jasper
Jasper (Silicate - SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Green, brown, and translucent bands, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (microcrystalline/cryptocrystalline), Cleavage: None, Specific Gravity: 2.6-2.9
- 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: Green, brown, and translucent bands, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (microcrystalline/cryptocrystalline), Cleavage: None, Specific Gravity: 2.6-2.9
Formation & geological history
Formed from the deposition of silica-rich fluids in cracks and cavities of volcanic or sedimentary rocks. This specimen shows water-worn tumbling, likely from a river or beach environment.
Uses & applications
Commonly used in jewelry, lapidary art, ornaments, and as pocket stones or for metaphysical collections.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone. It has been used for seals and amulets since the 4th millennium BCE.
Field identification & locations
Identify by its hardness (it will scratch glass) and its smooth, waxy feel when polished. Commonly found in coastal or riverbed gravels in regions with volcanic history.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary