sedimentary

Green Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Opaque green with yellow or brownish inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9

Hardness: 6
Color: Opaque green with yellow or brownish inclusions
Luster: Vitreous to waxy

Identified April 7, 2026More sedimentary →

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 infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Over time, silica solidifies into a microcrystalline structure, with the green color usually derived from silicate minerals like chlorite or iron inclusions.

Uses & applications

Commonly used in lapidary work for cabochons, beads, and stone carvings. Historically used for seals and spiritual talismans.

Geological facts

Green jasper is sometimes called 'the rain bringer' in ancient folklore. It is a dense, opaque variety of chalcedony that has been used for ornamentation since ancient Mesopotamian times.

Field identification & locations

Identify in the field by its hardness (it cannot be scratched by a steel knife), its smooth, waxy surface when wet, and its characteristic conchoidal fracture patterns. Frequently found in riverbeds or coastal areas where harder silica-based rocks accumulate.