sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
Hardness: 6.5-7 on Mohs scale; Color: Red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Red to brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91
Formation & geological history
Formed from silica-rich groundwater percolating through sedimentary rocks or volcanic ash, with iron inclusions providing the red color. Often found in Precambrian formations.
Uses & applications
Used primarily in lapidary work for making cabochons, beads, and decorative ornaments. Also used as a historical gemstone for signet rings and amulets.
Geological facts
Red Jasper was known as the 'stone of endurance' in ancient cultures and was frequently used by Viking and Germanic warriors to adorn sword hilt jewels for protection.
Field identification & locations
Identify by its opaque red color, smoothness, and extreme hardness (it will scratch glass). Commonly found in riverbeds and desert environments globally.
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