sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs), Color: Deep brick-red, Luster: Dull to vitreous, Crystal structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Deep brick-red, Luster: Dull to vitreous, Crystal structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of silica-rich fluids in volcanic ash or sedimentary deposits, where iron oxide (hematite) provides the red color. Often associated with Precambrian banded iron formations.
Uses & applications
Used primarily in lapidary arts for jewelry, decorative carvings, and cabochons. Historically used for seals and amulets. Also popular in the holistic/metaphysical trade.
Geological facts
The name Jasper comes from the Greek word 'iaspis', meaning 'spotted stone.' It is a member of the chalcedony family and has been a prized gemstone since antiquity, mentioned in the Bible and used in ancient Minoan Crete.
Field identification & locations
Identify by its opaque nature (unlike translucent carnelian), cherry-to-brick red color, and extreme hardness; it cannot be scratched by a steel knife. Commonly found in Western USA, India, Russia, and Brazil.
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