sedimentary
Jasper and Quartz conglomerate
Silicon Dioxide (SiO2) with iron oxide impurities
Hardness: 6.5-7 (Mohs scale), Color: Reddish-brown with white/translucent crystalline patches, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None/Conchoidal fracture
- 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: Reddish-brown with white/translucent crystalline patches, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None/Conchoidal fracture
Formation & geological history
Formed from silica-rich fluids precipitating in voids or cementing grains together within sedimentary environments, often colored by hematite (iron oxide). Found in various global deposits spanning from the Precambrian to Cenozoic eras.
Uses & applications
Commonly used for lapidary work, jewelry (cabochons), tumbling for decorative purposes, and as an ornamental stone due to its durability and color.
Geological facts
Jasper is a variety of chalcedony that owes its opacity and color to high levels of impurities. This specific piece shows a mixture of transparent quartz crystals and opaque red jasper.
Field identification & locations
Identify by its hardness (will scratch glass), varied opaque/translucent texture, and reddish coloration. Frequently found in riverbeds and glacial deposits. Common in regions like the Great Lakes or desert southwest USA.
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