sedimentary

Jasper with Hematite Inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Pale yellow-green with dark grey/black dendritic or speckled inclusions; Luster: Dull/waxy when unpolished; Crystal Structure: Microcrystalline; Specific Gravity: 2.6-2.9.

Hardness: 6
Luster: Dull/waxy when unpolished

Identified March 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from silica-rich fluids precipitating in the voids of sedimentary or volcanic rocks. The dark inclusions represent iron oxides such as hematite or magnetite that crystallized during the silica deposition. Often aged from the Mesozoic or Cenozoic eras.

Uses & applications

Used primarily for lapidary work, decorative garden stones, and as metaphysical 'pocket stones.' In larger quantities, it can be used for aggregate or ballast.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek 'iaspis,' meaning 'spotted stone.' This specific rounded specimen has been smoothed by fluvial (water) erosion.

Field identification & locations

Identify in the field by its hardness (it will scratch glass but cannot be scratched by a steel knife) and its smooth, water-worn texture. Commonly found in riverbeds, beaches, and glacial deposits globally.