sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron impurities
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline quartz); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline quartz); 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-grained sediments, where iron oxides precipitate to give the red color. Typically occurs in hydrothermal veins or as nodules in sedimentary rocks.
Uses & applications
Used primarily for jewelry (cabochons, beads), decorative carvings, lapidary art, and as a popular collector's stone due to its ability to take a high polish.
Geological facts
Red Jasper has been used by ancient civilizations for thousands of years; Egyptians used it for amulets and seals, and it was known as the 'mother of all stones' in some cultures for its supposed grounding properties.
Field identification & locations
Identify by its opaque red color, wax-like to dull luster when unpolished, and the lack of visible crystal grains. Often found in gravel beds or stream deposits. Common in the USA (Oregon, Idaho, California), Brazil, and South Africa.
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