sedimentary/mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs scale); Color: Bricky opaque red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Bricky opaque red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Bricky opaque red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91
Formation & geological history
Formed when silica-rich fluids permeate sedimentary or volcanic rocks, often through hydrothermal activity or secondary deposition. The red color comes from iron oxide (hematite) inclusions.
Uses & applications
Commonly used in jewelry (cabochons and beads), ornamental carvings, stone seals, and as an industrial abrasive in some contexts.
Geological facts
Red Jasper has been used since antiquity; it was known as the stone of endurance and was a favorite in the ancient world for making cylinder seals and jewelry in Egypt and Mesopotamia.
Field identification & locations
Identify by its deep red color, high hardness (it will scratch glass), and smooth, waxy feel when polished. Often found in riverbeds or near volcanic deposits globally, including the USA, Brazil, and India.
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