sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 on Mohs scale; Color: Opaque red/terracotta; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Opaque red/terracotta
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Opaque red/terracotta; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic or sedimentary environments, acquiring its red hue from high iron content. Can be found in deposits dating back to the Precambrian era.
Uses & applications
Used primarily in lapidary work for cabochons, beads, and carvings; historically used as a gemstone and for making tools due to its conchoidal fracture.
Geological facts
Red Jasper has been used by humans for thousands of years, known as a 'nurturing stone' in ancient cultures and cited in the Bible as one of the stones in the breastplate of the high priest.
Field identification & locations
Identify by its deep red color, opacity (light will not pass through edges), and smooth, shell-like fracture pattern. Common in riverbeds and desert environments worldwide, particularly in India, Brazil, and the USA.
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