sedimentary

Jasper Pebble

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Red/brown with gray-tan matrix, Luster: Dull to waxy, Crystal structure: Microcrystalline (trigonal), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.91

Hardness: 6

Identified June 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, typically during the Paleozoic or Mesozoic eras. The red coloration is due to iron (hematite) impurities.

Uses & applications

Used primarily as lapidary material, decorative stones in landscaping, and in jewelry as cabochons or tumbled stones. Also popular for meditation and crystal collections.

Geological facts

Jasper is an opaque variety of chalcedony. It has been used since antiquity for seals and ornamentation; the name comes from the Greek 'iaspis', meaning spotted stone.

Field identification & locations

Identify by its hardness (will scratch glass), opaque nature, and smooth, water-worn texture if found in riverbeds. Commonly found in gravel pits, river basins, and areas with ancient volcanic activity.