sedimentary

Green Jasper

Jasper (Silicon Dioxide, SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs), Color: Dark green with brown/gray inclusions, Luster: Vitreous to dull, Crystal Structure: Microcrystalline/Cryptocrystalline (Hexagonal/Trigonal system), Cleavage: None, Specific Gravity: 2.58-2.91

Hardness: 6

Identified May 17, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms through the deposition of silica from water-rich environments or the replacement of volcanic ash with silica. It is often found in sedimentary rocks as nodules or vein-filling minerals.

Uses & applications

Primarily used for lapidary purposes, including jewelry (cabochons), ornaments, beads, and as a decorative stone in sculptures.

Geological facts

Jasper has been used as a gemstone since antiquity; green varieties were highly prized in ancient Mesopotamia and Egypt. It is an opaque variety of chalcedony.

Field identification & locations

Identify in the field by its waxy luster, smooth conchoidal fracture, and extreme hardness (it will scratch glass). Commonly found in riverbeds or coastal areas in Oregon, California, and South Africa.