sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
Hardness: 6.5-7 (Mohs); Color: Red, brownish-red; Luster: Dull to greasy; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Red, brownish-red
- Luster
- Dull to greasy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Red, brownish-red; Luster: Dull to greasy; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic ash or sedimentary beds. The red color is derived from high hematite (iron) content. It is typically found in ancient sedimentary and metamorphic formations.
Uses & applications
Used primarily for jewelry (cabochons), ornamental carvings, crystal healing collections, and historically as tools/weaponry due to its sharpness when fractured.
Geological facts
In antiquity, Red Jasper was known as the 'stone of endurance' and was frequently used by ancient Egyptians in amulets to enhance physical energy and protection.
Field identification & locations
Identify in the field by its opaque red color and smooth, shell-like (conchoidal) fracture surfaces. It cannot be scratched by a steel knife. Commonly found in locations like the Western US, South Africa, and Brazil.
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