sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque green color, waxy to dull luster, trigonal crystal system (cryptocrystalline), conchoidal fracture with no true cleavage, and a specific gravity around 2.58 to 2.91.
Identified More sedimentary →
Explore Green Jasper 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, opaque green color, waxy to dull luster, trigonal crystal system (cryptocrystalline), conchoidal fracture with no true cleavage, and a specific gravity around 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids or radiolarian ooze in marine environments, often subjected to low-grade metamorphism or diagenesis over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, beads, decorative items, and as a semi-precious gemstone in jewelry.
Geological facts
Green jasper has been valued since ancient times for talismans and seals. The green color is typically imparted by iron impurities, chromium, or other mineral inclusions within the chalcedony matrix.
Field identification & locations
Can be identified by its distinctive green hue, hardness that easily scratches glass, and smooth waxy feel when tumbled or polished. Found worldwide in riverbeds, beaches, and mountainous regions where silica-bearing rocks weather.
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