sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide impurities
Hardness: 6.5-7 Mohs; Color: Brick red to deep brownish-red; Luster: Dull to vitreous (waxy when polished); Crystal Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture); Opaque.
- Hardness
- 6
- Color
- Brick red to deep brownish-red
- Luster
- Dull to vitreous (waxy when polished)
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brick red to deep brownish-red; Luster: Dull to vitreous (waxy when polished); Crystal Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture); Opaque.
Formation & geological history
Formed primarily in sedimentary environments where silica-rich fluids permeate through volcanic ash or sediment, with iron oxide inclusions providing the red pigmentation. It is often found in prehistoric iron formations or hydrothermal veins.
Uses & applications
Commonly used as a gemstone in jewelry, for lapidary work (cabochons and carvings), decorative ornaments, and as a popular specimen for rock collectors and metaphysical practitioners.
Geological facts
Red Jasper has been used since ancient times for amulets and carvings. It is known as a stone of endurance and was referred to in some ancient cultures as the 'blood of the Earth'. It belongs to the chalcedony family.
Field identification & locations
Identified in the field by its distinct opaque red color, smoothness, and conchoidal (shell-like) fracture patterns. It is found globally, with notable deposits in India, Brazil, Australia, and the western United States. It will not scratch with a steel knife but can scratch glass.
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