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 dull, Crystal structure: Hexagonal (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: Vitreous to dull, Crystal structure: Hexagonal (trigonal) microcrystalline, Cleavage: None/Conchoidal fracture, Specific gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine sediments, where iron oxides provide the deep red pigmentation. Often found as water-worn pebbles in stream beds or coastal areas.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and carvings. Historically used for seals and amulets. Also used as decorative landscaping stone.
Geological facts
Red jasper has been a favored stone for thousands of years; it was referred to as the 'mother of all stones' in some ancient cultures and was used in the Breastplate of the High Priest in biblical times.
Field identification & locations
Identify in the field by its opaque red color, smoothness from erosion, and inability to be scratched by a steel knife. Common in the United States (West Coast and Great Lakes), India, and Brazil.
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