sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Dull to vitreous, Crystal structure: 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 brownish-red, Luster: Dull to vitreous, Crystal structure: Trigonal (microcrystalline), Cleavage: None/Conchoidal fracture, Specific gravity: 2.58-2.91
Formation & geological history
Formed when silica-rich fluids permeate through volcanic ash or sedimentary rocks, often during the oxidation of iron. Common in hydrothermal deposits or as nodules in sedimentary layers.
Uses & applications
Used extensively in jewelry for cabochons and beads, as an ornamental stone for carvings and vases, and historically for seal stones and tools.
Geological facts
Red Jasper was known to many ancient civilizations as a stone of protection and endurance; it was mentioned in the Bible and used by ancient Egyptians for amulets.
Field identification & locations
Identify by its deep red color, conchoidal (shell-like) fracture, and inability to be scratched by a steel knife. It is frequently found in riverbeds or gravel deposits.
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