sedimentary

Jasper (Green variety)

SiO2 (Silicon Dioxide with iron/chlorite inclusions)

Hardness: 6.5-7 on Mohs scale. Color: Dull green to deep teal. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (Microcrystalline). Cleavage: None, exhibits conchoidal fracture. Specific Gravity: 2.58–2.91.

Hardness: 6
Color: Dull green to deep teal
Luster: Vitreous to waxy

Identified March 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica from water-saturated solutions in volcanic ash or fine-grained sediments. It often forms through hydrothermal processes or within hydrothermal veins over millions of years.

Uses & applications

Primarily used for lapidary work, jewelry (cabs and beads), decorative ornaments, and as a healing stone in metaphysical communities. Historically used for seal stones and tools.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. It was one of the favorite gemstones of antiquity and is mentioned in numerous historical texts including the Bible.

Field identification & locations

Identify in the field by its opacity (it will not let light through even at the edges), smooth waxy feel when tumbled, and its ability to scratch glass. Commonly found in riverbeds or coastal areas in Oregon, India, Brazil, and Egypt.

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