Mineral (variety of Chalcedony/Quartz)
Red Jasper
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
Hardness: 6.5–7 (Mohs scale); Color: Deep opaque red; Luster: Vitreous to dull (high polish shown); Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Deep opaque red
- Luster
- Vitreous to dull (high polish shown)
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Deep opaque red; Luster: Vitreous to dull (high polish shown); Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91.
Formation & geological history
Formed when silica-rich fluids permeate volcanic rocks or sedimentary beds, often associated with iron-rich environments. Its geological age spans from the Precambrian to more recent epochs depending on the deposit location.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a popular semi-precious stone for gemstone collectors and metaphysical practices.
Geological facts
The vibrant red color is caused by the presence of hematite (iron oxide). It has been used since antiquity by the Egyptians and Hittites for seals and amulets, and is mentioned in the Bible as one of the stones in the High Priest's breastplate.
Field identification & locations
Identify by its opaque nature (unlike carnelian which is translucent), its hardness (will scratch glass), and its distinctive brick-red color. Commonly found in India, Brazil, Madagascar, and the Southwestern United States.
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Silicon Dioxide (SiO₂)
Mineral (Variety of Chalcedony/Quartz)
Red Jasper
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
Mineral (variety of Chalcedony/Quartz)
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Brecciated Jasper
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Calcite (Calcium Carbonate, CaCO3)
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