sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Deep red to brownish-red; Luster: Dull to waxy; Crystal structure: Microcrystalline/Trigonal; Cleavage: None; Fracture: Conchoidal; Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Deep red to brownish-red
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep red to brownish-red; Luster: Dull to waxy; Crystal structure: Microcrystalline/Trigonal; Cleavage: None; Fracture: Conchoidal; Specific gravity: 2.58-2.91.
Formation & geological history
Formed through the infiltration of silica-rich fluids into sediment or volcanic ash, typically during the Precambrian to Paleozoic eras. The red color is caused by the inclusion of hematite (iron oxide).
Uses & applications
Primarily used as a gemstone for jewelry, lapidary arts (cabochons and beads), and ornamental carvings. Historically used for seals and amulets.
Geological facts
Commonly known as the 'stone of endurance' in metaphysical circles. Red jasper is often found in large deposits and has been used by humans since antiquity for both tools and decoration.
Field identification & locations
Identify in the field by its opaque red color, smoothness when water-worn, and hardness (it will scratch glass). Common in riverbeds and arid regions like the American Southwest and India.
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