sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5–7 on Mohs scale. Color: Opaque reddish-brown due to iron impurities. Luster: Vitreous to dull. Crystal structure: Cryptocrystalline microquartz. Cleavage: None (conchoidal fracture).

Hardness: 6
Color: Opaque reddish-brown due to iron impurities
Luster: Vitreous to dull

Identified June 5, 2026More sedimentary →

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Physical properties

Hardness: 6.5–7 on Mohs scale. Color: Opaque reddish-brown due to iron impurities. Luster: Vitreous to dull. Crystal structure: Cryptocrystalline microquartz. Cleavage: None (conchoidal fracture).

Formation & geological history

Formed from the deposition of silica in groundwater or volcanic environments, often where iron oxides or organic materials are present to provide pigmentation. Found in veins or nodules within volcanic rocks and sedimentary formations.

Uses & applications

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

Geological facts

Jasper has been used by ancient civilizations for seals, amulets, and jewelry for thousands of years. The name comes from the Greek word 'iaspis', meaning 'spotted stone'.

Field identification & locations

Identify by its extreme hardness (cannot be scratched by a steel knife) and its smooth, waxy luster when polished. It is commonly found in riverbeds, beaches, and desert plains globally.