sedimentary
Jasper with Agate Inclusions
Silicon Dioxide (SiO2)
Hardness: 6.5-7 Mohs; Color: Opaque brick red with translucent white/grey/amber inclusions; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Opaque brick red with translucent white/grey/amber inclusions; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from mineral-rich water in cavities or volcanic ash. The red color comes from iron impurities. These varieties are often formed in the Cretaceous or Neogene periods in hydrothermal or sedimentary environments.
Uses & applications
Primarily used for lapidary arts, decorative items (like this polished egg), cabochons for jewelry, and metaphysical collecting.
Geological facts
Jasper and Agate are both varieties of chalcedony. The main difference is transparency: Jasper is opaque while Agate is translucent. This piece showcases a brecciated or vuggy appearance where agate filled gaps in the jasper matrix.
Field identification & locations
Identify by its hardness (cannot be scratched by a steel knife) and the distinctive mix of opaque red and translucent sections. Commonly found in Oregon (USA), South Africa, and Madagascar.
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