sedimentary
Red Jasper (possibly with Hematite/Magnetite inclusions)
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 on Mohs scale; Color: Rusty red with black mottled streaks; Luster: Dull to waxy; Structure: Microcrystalline (Cryptocrystalline); Cleavage: None/Conchoidal fracture.
- Hardness
- 6
- Color
- Rusty red with black mottled streaks
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Rusty red with black mottled streaks; Luster: Dull to waxy; Structure: Microcrystalline (Cryptocrystalline); Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed from the deposition of silica-rich sediments where iron oxides provide the deep red pigment. This river-worn pebble likely weathered out of a larger vein and was rounded by water transport over millions of years.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons), as decorative landscaping stone, and as a popular 'worry stone' or collector's specimen.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone. It has been used since antiquity for seals and ornamentation.
Field identification & locations
Identify by its opacity (unlike translucent carnelian), its high hardness (doesn't scratch with a knife), and typical smooth, water-worn texture when found in riverbeds or on beaches.
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