sedimentary

Jasper

Silicon dioxide (SiO2) with impurities

Hardness: 6.5-7 (Mohs scale); Color: Brown, tan, with darker mottling; Luster: Waxy to vitreous; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brown, tan, with darker mottling
Luster: Waxy to vitreous

Identified June 2, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Brown, tan, with darker mottling; Luster: Waxy to vitreous; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica in sedimentary environments, often associated with hydrothermal or volcanic processes where iron and other minerals tint the stone. This specimen appears water-worn or tumbled.

Uses & applications

Used primarily for lapidary work, jewelry making (cabochons), interior decoration, and as a popular collector's item due to its varied aesthetic patterns.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek for 'spotted stone'. It was a favorite gem in the ancient world, mentioned in biblical and Babylonian texts.

Field identification & locations

Identify by its hardness (will scratch glass), opaque nature, and smooth, conchoidal fracture. Commonly found in riverbeds and coastal regions worldwide.