sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish red; Luster: Vitreous to waxy (especially when tumbled); Crystal Structure: Hexagonal (Trigonal), microcrystalline; Cleavage: None
- Hardness
- 6
- Color
- Brick red to brownish red
- Luster
- Vitreous to waxy (especially when tumbled)
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish red; Luster: Vitreous to waxy (especially when tumbled); Crystal Structure: Hexagonal (Trigonal), microcrystalline; Cleavage: None
Formation & geological history
Formed through the accumulation of fine volcanic ash or silica-rich sediments, where iron oxides (hematite) infiltrate the silica during the lithification process, resulting in its deep red opaque color.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons, beads), decorative carvings, and as a popular stone for tumbling and crystal healing collections.
Geological facts
Red Jasper is known as an opaque variety of chalcedony. It has been used since antiquity in seals, jewelry, and ornamentation by Egyptians and Minoans. It is often referred to as a stone of endurance.
Field identification & locations
Identify by its solid red color, high hardness (it cannot be scratched by a steel knife), and its smooth, opaque appearance. Commonly found in Brazil, India, South Africa, and the USA.
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