sedimentary

Tumbled Jasper

Silicon dioxide with impurities (Microcrystalline Quartz, SiO2)

Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque transparency, trigonal crystal system with cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91, commonly displaying distinctive brownish-yellow banded or patterned coloration from iron oxide impurities.

Identified August 6, 2026More sedimentary →

Explore Tumbled Jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through the hydrothermal alteration of silica-rich sediments or volcanic ash, often precipitating in marine environments or cavity fillings over millions of years.

Uses & applications

Commonly used in ornamental jewelry, decorative polished stones, lapidary arts, and metaphysical crystal collections.

Geological facts

Jasper has been used throughout human history since ancient times for talismans, seals, and weaponry components due to its toughness and ability to take a high polish.

Field identification & locations

Easily identified by its opaque nature, high hardness that scratches glass, smooth tumbled pebble form, and distinctive earthy color patterns. Found worldwide in riverbeds and secondary alluvial deposits.

Other sedimentary specimens

See all

Sandstone or Siltstone

Arenite (if sandstone)

Sedimentary

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

fossil

Quartz pebble

Silicon dioxide (SiO2)

sedimentary

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

sedimentary

Banded Siltstone / Mudstone Pebble

Siltstone / Argillite

sedimentary

Sedimentary Sandstone

Arenite (Sedimentary Rock)

sedimentary