sedimentary
Green Jasper / Chalcedony
Silicon Dioxide (SiO2)
Hardness: 6.5-7 Mohs; Color: Dark green with translucency; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Dark green with translucency
- Luster
- Vitreous to waxy
Identified More sedimentary →
Explore Green Jasper / Chalcedony in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 Mohs; Color: Dark green with translucency; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed from silica-rich fluids precipitating in volcanic rock cavities or sedimentary environments, often associated with hydrothermal activity. Can be millions of years old.
Uses & applications
Used primarily for ornamental purposes, lapidary art, jewelry, and as a collector's specimen.
Geological facts
Jasper is an opaque variety of chalcedony. When it shows significant translucency as seen in this image, it may be classified as green chalcedony or plasma.
Field identification & locations
Identify by its waxy luster, smooth conchoidal fracture when broken, and inability to be scratched by a steel knife. Commonly found in Brazil, India, and the USA.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary