sedimentary

Jasper

Silicon dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Yellow-brown/ochre due to iron oxide inclusions; Luster: Dull to waxy; Structure: Microcrystalline (Cryptocrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.6-2.9.

Hardness: 6
Color: Yellow-brown/ochre due to iron oxide inclusions
Luster: Dull to waxy

Identified June 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of fine-grained silica in organic or volcanic sediments. Frequently found as stream-rounded pebbles or nodules, its yellow/brown hue indicates the presence of goethite or limonite.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons), talismans, and ornamental carvings. Historically used for making tools due to its hardness.

Geological facts

Jasper is an opaque variety of chalcedony. Yellow jasper specifically was historically associated with protection during travel and spiritual guidance.

Field identification & locations

Look for a smooth, water-worn texture with an opaque body that does not transmit light. Found in riverbeds, beaches, and desert plains worldwide. Collectors value stones with intense, uniform color or unique patterns.