sedimentary

Green Jasper

Silicon dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Opaque dark green; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Opaque dark green
Luster: Vitreous to dull

Identified May 20, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Opaque dark 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 deposition of silica from water-rich environments, often in volcanic ash beds or hydrothermal veins where iron minerals provide the green pigmentation. Their smooth appearance suggests river or beach tumbling.

Uses & applications

Primarily used for lapidary work, jewelry (beads and cabochons), decorative ornaments, and as a healing stone in metaphysical communities.

Geological facts

Jasper is an opaque variety of chalcedony. The word 'jasper' comes from the Greek 'iaspis', meaning 'spotted stone'. It was one of the stones used in the breastplate of the High Priest in Biblical times.

Field identification & locations

Identify in the field by its opaque nature (it does not transmit light even at edges) and smooth, waxy feel when water-worn. Common in riverbeds and coastal regions globally, notably in India, Brazil, and the USA.