sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown and grayish color, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.58 to 2.91
Identified More sedimentary →
Explore Jasper Pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown and grayish color, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.58 to 2.91
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks where silica-rich fluids replace original material, often shaped into a smooth pebble by wave action on a beach.
Uses & applications
Used for lapidary work, making jewelry, ornamental carvings, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry. Beach pebbles like this are smoothed over thousands of hours of tumbling in water and sand.
Field identification & locations
Found worldwide in riverbeds, beaches, and ancient deposits. Easily identified by its hardness, opacity, and smooth water-worn surface.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary