sedimentary
Jasper with Hematite Inclusions
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
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
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Physical properties
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.
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.
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