sedimentary

Jasper (Green)

Silicon Dioxide (SiO2) with impurities

Hardness: 6.5-7 (Mohs scale); Color: Deep green with opaque gray/white veining; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Deep green with opaque gray/white veining
Luster: Vitreous to waxy

Identified March 16, 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 sediments. Over geological time (millions of years), the silica crystallizes into microcrystalline quartz, with iron systems or clay inclusions providing the green pigmentation.

Uses & applications

Used primarily for lapidary arts, jewelry (cabochons and beads), ornamental carvings, and as a popular semi-precious stone for mineral collectors.

Geological facts

Jasper is an opaque variety of chalcedony. In ancient times, green jasper was often referred to as 'rain-bringer' and was used in amulets and seals dating back to the Indus Valley Civilization.

Field identification & locations

Identify in the field by its high hardness (it will scratch glass), opaque nature even on thin edges, and smooth, waxy feel when water-worn. Common in riverbeds and coastal areas globally, particularly in India, Russia, and the western United States.

Other sedimentary specimens

See all

Sandstone or Siltstone

Arenite (if sandstone)

Sedimentary

Sandstone

Arenite (primarily SiO2)

sedimentary

Shale or Slaty Mudstone

Argillaceous sedimentary rock

sedimentary

Chert Breccia

Brecciated Chert (Microcrystalline Silica)

sedimentary

Sandstone (Quartz-rich)

Arenite (SiO2)

sedimentary

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

sedimentary