sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, red, brown, yellow, or green colors, vitreous to dull luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity of 2.58-2.91
Identified More sedimentary →
Explore Jasper in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6.5-7 on the Mohs scale, red, brown, yellow, or green colors, vitreous to dull luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity of 2.58-2.91
Formation & geological history
Formed from silicon dioxide-rich solutions precipitating in sedimentary or volcanic environments, often involving the replacement of organic material or silification of rocks over millions of years
Uses & applications
Used in ornamental carvings, jewelry, lapidary arts, and as a collector's specimen
Geological facts
Jasper has been used since ancient times for amulets, seals, and tools, and is mentioned in various historical texts for its beauty and perceived mystical properties
Field identification & locations
Can be identified in the field by its opaque appearance, waxy luster, hardness that scratches glass, and smooth conchoidal breakage; found globally in regions with volcanic or hydrothermal activity
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary