sedimentary

Jasper with Hematite

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Ocher, burnt orange, brown, and gray; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.5-2.9

Hardness: 6
Color: Ocher, burnt orange, brown, and gray
Luster: Dull to waxy

Identified July 4, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Ocher, burnt orange, brown, and gray; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.5-2.9

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, often in hydrothermally active areas or Precambrian seafloor environments where iron and silica precipitated together.

Uses & applications

Used primarily for decorative purposes, lapidary arts (cabochons, beads), and as a collector's specimen. In ancient times, it was used for seals and tools.

Geological facts

The orange and brown colors are caused by iron inclusions. The term 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone. It is a dense, opaque variety of chalcedony.

Field identification & locations

Identify by its opacity, hardness (will scratch glass), and dull luster compared to quartz. Common in riverbeds and desert environments globally; notably found in the Western United States, Australia, and Madagascar.