sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish red, Luster: Dull to vitreous, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None, Fracture: Conchoidal.
- 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/cryptocrystalline), Cleavage: None, Fracture: Conchoidal.
Formation & geological history
Formed primarily in sedimentary environments when silica-rich fluids permeate through volcanic ash or sediment, often enriched with hematite which provides the red color. These can date back to various geological eras, including the Precambrian.
Uses & applications
Used extensively in jewelry for cabochons and beads, as an ornamental stone in decorative carvings, and as a popular specimen for rock tumbling and metaphysical collecting.
Geological facts
Red jasper is known for its opacity and unique patterns; it was once considered a sacred stone by various ancient civilizations including the Egyptians and Native Americans for protection and courage.
Field identification & locations
Identify in the field by its smooth, waxy texture when wet, high hardness (cannot be scratched by a steel nail), and lack of transparency. Common in riverbeds and regions with volcanic history, particularly in the western United States and Brazil.
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