sedimentary

Jasper (Green)

Silicon Dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

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 →

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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.