sedimentary
Red Jasper with Chalcedony Banding
Microcrystalline Quartz (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs scale); Color: Red, brown, and white; Luster: Dull/waxy (unpolished) to Vitreous (polished); Structure: Microcrystalline; Cleavage: None/Conchoidal fracture.
- Hardness
- 6
- Color
- Red, brown, and white
- Luster
- Dull/waxy (unpolished) to Vitreous (polished)
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Red, brown, and white; Luster: Dull/waxy (unpolished) to Vitreous (polished); Structure: Microcrystalline; Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed when silica-rich fluids permeate through volcanic ash or sedimentary rocks, precipitating microcrystalline quartz. The red color is caused by iron (hematite) inclusions.
Uses & applications
Commonly used for lapidary work, cabochons, jewelry, decorative carvings, and as a pocket stone for collectors.
Geological facts
Jasper is often found in association with agate (the translucent bands). It has been used since antiquity for seals, ornaments, and ritual tools.
Field identification & locations
Identify by its opacity, conchoidal fracture, and ability to scratch glass. Commonly found in riverbeds, desert regions, and worldwide volcanic deposits.
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