sedimentary
Red Jasper with Quartz
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 Mohs. Color: Brick red with white veins. Luster: Dull to Vitreous. Crystal Structure: Trigonal (Microcrystalline/Cryptocrystalline). Cleavage: None. Conchoidal fracture.
- Hardness
- 6
- Color
- Brick red with white veins
- Luster
- Dull to Vitreous
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Physical properties
Hardness: 6.5-7 Mohs. Color: Brick red with white veins. Luster: Dull to Vitreous. Crystal Structure: Trigonal (Microcrystalline/Cryptocrystalline). Cleavage: None. Conchoidal fracture.
Formation & geological history
Formed primarily in sedimentary environments where silica-rich fluids permeate through volcanic ash or sediment, often enriched with iron minerals like hematite which provide the red color. White bands are quartz vein intrusions.
Uses & applications
Commonly used for lapidary work, decorative cabochons, tumbled stones for metaphysical purposes, and as an ornamental landscaping stone.
Geological facts
Red jasper was historically known as the 'stone of endurance' and was used in ancient times for talismans. Its red color is derived from iron content within the silicate matrix.
Field identification & locations
Identify by its characteristic brick-red opacity and hardness (it will scratch glass). Often found in riverbeds, glacial tills, or coastal areas like the beaches of the Great Lakes or the Pacific Northwest.
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