sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Ferric Iron inclusions
Hardness: 6.5-7 (Mohs). Color: Brick red to brownish-red. Luster: Vitreous to dull. Crystal structure: Microcrystalline/Cryptocrystalline (Trigonal). Cleavage: None (Conchoidal fracture). Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs). Color: Brick red to brownish-red. Luster: Vitreous to dull. Crystal structure: Microcrystalline/Cryptocrystalline (Trigonal). Cleavage: None (Conchoidal fracture). Specific Gravity: 2.58-2.91.
Formation & geological history
Formed primarily in sedimentary environments where silica-rich fluids permeate through volcanic ash or sediment, with iron oxides providing the red coloration. Many specimens are found as river-worn pebbles.
Uses & applications
Used extensively in jewelry for cabochons, beads, and carvings. Also used in industrial lapidary work, decorative landscaping, and as an ornamental stone.
Geological facts
Jasper was a favorite gem in the ancient world; it was mentioned in the Bible and used by ancient Egyptians and Minoans. Red jasper is specifically known as the stone of endurance and physical strength.
Field identification & locations
Identify by its deep red color, high hardness (cannot be scratched by steel), and smooth, waxy surface when polished. Commonly found in gravel beds, stream deposits, and desert pavements worldwide.
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