sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
Hardness: 6.5-7 on Mohs scale; Color: Opaque red/brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Opaque red/brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Opaque red/brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture).
Formation & geological history
Formed primarily in sedimentary environments where silica-rich fluids permeate through volcanic ash or clay, with iron inclusions providing the distinct red pigment. Many specimens are found in weathered gravels or ancient river beds.
Uses & applications
Used extensively in jewelry for cabochons and beads, as an ornamental stone for carvings and mosaics, and highly valued by collectors for its vibrant color.
Geological facts
Red Jasper has been used since antiquity; it was known as the 'mother of all stones' in some cultures and was used in ancient Egypt for amulets and carvings.
Field identification & locations
Identify in the field by its opaque red color and smooth, waxy/dull surface. Its high hardness means it cannot be scratched by a steel knife. Frequently found in areas with volcanic activity or river deposits in places like India, Brazil, and the USA.
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