sedimentary
Red Jasper
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
Hardness: 6.5-7 on Mohs scale; Color: Deep red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Deep red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Deep red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91.
Formation & geological history
Formed primarily when silica-rich fluids permeate through volcanic ash or sedimentary deposits, picking up iron oxide (hematite) which provides the red pigment. It is a microcrystalline variety of quartz.
Uses & applications
Used extensively in jewelry, lapidary arts for cabochons and beads, ornamental carvings, and as a decorative stone in aquariums and landscaping.
Geological facts
Red Jasper has been used since ancient times for amulets and carvings; the Ancient Egyptians associated it with the blood of Isis. It is also known as a 'nurturing stone' in metaphysical circles.
Field identification & locations
Identify in the field by its opaque nature (unlike carnelian which is translucent), its smooth conchoidal fracture, and it cannot be scratched by a steel knife. Commonly found in South Africa, Brazil, and the USA.
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