sedimentary

Green Jasper

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Olive green; Luster: Vitreous to dull; Crystal structure: Trigonal (Microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91

Hardness: 6
Color: Olive green
Luster: Vitreous to dull

Identified June 14, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Olive green; Luster: Vitreous to dull; Crystal structure: Trigonal (Microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91

Formation & geological history

Formed through the accumulation of silica-rich volcanic ash or sediments subjected to low-grade metamorphism and hydrothermal activity. Often found in volcanic environments or riverbeds as tumbled pebbles.

Uses & applications

Commonly used in lapidary arts, jewelry making (cabochons), as decorative landscaping stone, and occasionally in industrial grinding media.

Geological facts

Green jasper was exceptionally popular in the ancient world, particularly in the Mediterranean and Mesopotamia, where it was often used to carve cylinder seals and amulets believed to bring rain.

Field identification & locations

Identify by its hardness (will scratch glass), smooth waxy texture, and opaque nature. Commonly found in coastal areas, river beds, and volcanic deposits globally, including the western US, India, and Brazil.