sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 Mohs; Color: Rusty red, brick red to terracotta; Luster: Vitreous to dull; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Conchoidal fracture.
- Hardness
- 6
- Color
- Rusty red, brick red to terracotta
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 Mohs; Color: Rusty red, brick red to terracotta; Luster: Vitreous to dull; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Conchoidal fracture.
Formation & geological history
Formed when silica-rich fluids permeate through volcanic or sedimentary deposits, and the iron inclusion provides the red pigment. Often found in hydrothermal veins or as nodules in volcanic rocks.
Uses & applications
Used extensively in jewelry as cabochons, beads, and carved figurines; historically used for seals, amulets, and stone tools.
Geological facts
Red Jasper was known as the 'rain-bringer' in Native American traditions and was believed in ancient Egypt to be the fertilizing blood of Mother Isis.
Field identification & locations
Identify by its deep red color, extreme hardness (it will scratch glass), and its completely opaque nature even when held to light. Common in river beds and desert plains.
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