sedimentary
Red Jasper
Chalcedony (SiO2) with iron inclusions
Hardness: 6.5–7 (Mohs scale), Color: Brick-red to deep terracotta, Luster: Vitreous to dull, Crystal structure: Hexagonal (trigonal microcrystalline), Cleavage: None (conchoidal fracture), Specific gravity: 2.58–2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5–7 (Mohs scale), Color: Brick-red to deep terracotta, Luster: Vitreous to dull, Crystal structure: Hexagonal (trigonal microcrystalline), Cleavage: None (conchoidal fracture), Specific gravity: 2.58–2.91
Formation & geological history
Formed through the deposition of silica in hydrothermal veins or sedentary volcanic environments; the red color is caused by the inclusion of iron oxide (hematite) during formation. It can occur in deposits spanning various geological ages.
Uses & applications
Commonly used for lapidary work, jewelry (cabochons and beads), decorative ornaments, and widely collected for its association with metaphysical grounding properties.
Geological facts
Jasper was a favorite gem in ancient times and is even mentioned in the Bible as a stone in the Breastplate of Aaron. It has been used for seals, amulets, and architectural decoration for thousands of years.
Field identification & locations
Identify in the field by its opaque reddish appearance and conchoidal fracture (smooth, curved breaks). Found globally in locations such as India, South Africa, Brazil, and the Southwestern US. Collectors should look for vibrant colors and minimal pitting.
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