sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs), Color: Opaque red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Opaque red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
Formation & geological history
Formed primarily through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, occurring over millions of years. Its red color originates from high concentrations of iron oxide (hematite) during its formation.
Uses & applications
Commonly used in lapidary arts for cabochons, beads, and carvings. Historically used for seals, talismans, and decorative architecture. Widely used today as a pocket stone for spiritual/metaphysical collecting.
Geological facts
Red Jasper was historically known as the 'stone of endurance.' It is a variety of chalcedony that can contain up to 20 percent of foreign materials, which gives each specimen unique patterns or streaks.
Field identification & locations
Identify in the field by its opaque nature (unlike translucent carnelian), its high hardness (not scratched by a steel blade), and its conchoidal fracture. Often found in riverbeds or near areas of volcanic activity.
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