sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities
Hardness: 6.5-7 Mohs; Color: Opaque red to brownish-red; Luster: Vitreous to dull (waxy when polished); Crystal Structure: Trigonal (microcrystalline); Fracture: Conchoidal; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Opaque red to brownish-red
- Luster
- Vitreous to dull (waxy when polished)
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Physical properties
Hardness: 6.5-7 Mohs; Color: Opaque red to brownish-red; Luster: Vitreous to dull (waxy when polished); Crystal Structure: Trigonal (microcrystalline); Fracture: Conchoidal; Specific Gravity: 2.58-2.91
Formation & geological history
Formed when fine silica-rich materials are deposited in various environments, often through hydrothermal activity or deep-sea sedimentation where iron oxide impurities provide the red pigmentation.
Uses & applications
Used extensively in jewelry as cabochons, beads, and tumbled stones; also used for decorative carvings, seals, and as an ornamental stone in mosaics.
Geological facts
Known as the 'Stone of Endurance' and 'Supreme Nurturer' in metaphysical circles, red jasper has been used since antiquity by Egyptians and Native Americans for amulets and protective jewelry.
Field identification & locations
Identify by its deep red color, opacity, and smooth conchoidal fracture. It is a common find in riverbeds and arid regions where volcanic ash or sedimentary silica is present.
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