sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 on Mohs scale; Color: Brick red to brownish-red with grey, green, or yellow veining; Luster: Waxy to vitreous when wet or polished; Crystal Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Luster
- Waxy to vitreous when wet or polished
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Brick red to brownish-red with grey, green, or yellow veining; Luster: Waxy to vitreous when wet or polished; Crystal Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture).
Formation & geological history
Forms when silica-rich fluids precipitate within volcanic ash beds, sedimentary rocks, or hydrothermal veins. The characteristic deep red color is caused by finely dispersed iron oxide inclusions (hematite).
Uses & applications
Widely used for lapidary work, cabochons, tumbled gemstones, decorative carvings, and beads. Popular among mineral collectors and beachcombers.
Geological facts
Red Jasper has been used since antiquity in seals, amulets, and mosaics. Its rich red coloration made it a symbolic stone of strength, vitality, and protection in ancient cultures including Egypt and Greece.
Field identification & locations
Identified by its opaque, smooth, microcrystalline texture and rich reddish coloration with characteristic patterning. Frequently found as water-worn pebbles along gravel bars, riverbeds, and ocean beaches worldwide.
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