sedimentary
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to waxy; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Opaque.
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to waxy; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Opaque.
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic or sedimentary environments, often associated with hydrothermal activity. Over time, high pressure and temperature lithify these sediments into dense, opaque quartz.
Uses & applications
Used primarily as a decorative stone, in lapidary work for cabochons and beads, as an ornamental stone, and in 'healing' crystal practices.
Geological facts
Jasper has been used as a gemstone since antiquity; it was mentioned in various ancient cultures as a stone for protection. The presence of iron(III) oxide is what gives this specimen its characteristic red color.
Field identification & locations
Identify by its opacity (unlike translucent carnelian), its high hardness (it will scratch glass), and its smooth, waxy feel when weathered. Commonly found in riverbeds and desert environments.
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