sedimentary
Jasper with Iron Staining
Silicon Dioxide (SiO2) with Ferric Oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: green, yellow-brown, and rust-orange; Luster: waxy to vitreous; Crystal Structure: microcrystalline trigonal; Specific Gravity: 2.58–2.91.
- Hardness
- 6
- Color
- green, yellow-brown, and rust-orange
- Luster
- waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: green, yellow-brown, and rust-orange; Luster: waxy to vitreous; Crystal Structure: microcrystalline trigonal; Specific Gravity: 2.58–2.91.
Formation & geological history
Formed through the accumulation of silica from either volcanic ash or hydrothermal solutions into cracks or as nodules within sedimentary rocks. Its colors are derived from iron oxides that infiltrated the silica during or after formation.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons), and as decorative polished stones. Historically used for making tools due to its conchoidal fracture.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone'. This specific specimen shows 'limonite' staining, which gives it the characteristic rusty orange streaks.
Field identification & locations
Identify in the field by its opacity, waxy texture when wet, and the fact that it cannot be scratched by a steel knife. Common in riverbeds and coastal areas where volcanic activity once occurred.
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