sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs scale); Color: Deep brick red with hints of green/gray; Luster: Vitreous to waxy; Structure: Microcrystalline quartz (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep brick red with hints of green/gray
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Deep brick red with hints of green/gray; Luster: Vitreous to waxy; Structure: Microcrystalline quartz (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica-rich fluids in volcanic or sedimentary environments, often involving the replacement of organic materials or minerals. Its red color comes from iron oxide (hematite) inclusions incorporated during formation millions of years ago.
Uses & applications
Widely used for lapidary work, cabochons, beads for jewelry, ornamental carvings, and as a popular stone for tumbling and collecting due to its ability to take a high polish.
Geological facts
Red jasper was historically known as the 'stone of endurance' and was used by many ancient cultures, including the Egyptians and Native Americans, for protection and strength. It is an opaque variety of chalcedony.
Field identification & locations
Identify by its smooth, dense feel, rich red color that doesn't scratch easily with steel, and waxy luster. Commonly found in riverbeds, deserts, and coastal areas, particularly in regions like the western United States, India, and Brazil.
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