sedimentary
Green Jasper / Chert
Microcrystalline Quartz (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Dark forest green to teal green; Luster: Vitreous to waxy/dull; Fracture: Conchoidal with sharp edges; Structure: Cryptocrystalline/Microcrystalline.
- Hardness
- 6
- Color
- Dark forest green to teal green
- Luster
- Vitreous to waxy/dull
Identified More sedimentary →
Explore Green Jasper / Chert in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Dark forest green to teal green; Luster: Vitreous to waxy/dull; Fracture: Conchoidal with sharp edges; Structure: Cryptocrystalline/Microcrystalline.
Formation & geological history
Formed through the precipitation of silica in deep-sea sedimentary environments, hydrothermal veins, or replacement of volcanic ash deposits.
Uses & applications
Used primarily as decorative ornamental stone, lapidary rough for cabochons and carving, tumbled stones, and historically for flintknapping arrowheads and stone tools.
Geological facts
Green jasper gets its vivid green coloration from inclusions of iron-rich silicate minerals such as chlorite, celadonite, or actinolite distributed within the quartz matrix.
Field identification & locations
Identified by its distinctive conchoidal fracture, sharp smooth surfaces, opacity, hardness (cannot be scratched by steel), and smooth waxy feel. Commonly found worldwide, including India, Russia, Madagascar, and western USA.
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