sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to greasy; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.58 - 2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to greasy; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.58 - 2.91
Formation & geological history
Formed through the deposition of silica from water-rich environments (sedimentary) or thermal fluids. The red color comes from iron oxide (hematite) impurities integrated during crystallization. Ages vary widely by location, from Precambrian to Cenozoic.
Uses & applications
Used primarily in lapidary arts for jewelry (beads, cabochons), ornamental decorative objects, and as a healing stone in spiritual practices. Historically used for making tools and seals.
Geological facts
Jasper has been used throughout history; it was mentioned in the Bible and used by ancient Egyptians and Greeks to create protective amulets. Red jasper is often referred to as the 'Stone of Endurance'.
Field identification & locations
Identify in the field by its opaque brick-red color, extreme hardness (it will scratch glass), and smooth, shell-like (conchoidal) fracture surface. Common in river beds and desert regions in the USA (Southwest), India, Russia, and Brazil.
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