sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Deep red to brick red; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep red to brick red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep red to brick red; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of silica from volcanic ash or micro-organisms in sedimentary environments, where iron inclusions provide the red color. Typically found in hydrothermal veins or as nodules in volcanic rock.
Uses & applications
Widely used as a gemstone for jewelry (cabochons, beads), decorative carvings, lapidary art, and historically for tools and seals.
Geological facts
Red jasper was a favorite in the ancient world, often used in Babylonian cylinder seals and described in the Bible as a stone of the high priest's breastplate. It is known as the 'Supreme Nurturer' in metaphysical circles.
Field identification & locations
Identify by its opaque red color, waxy luster, and concoidal fracture. It will scratch glass but cannot be scratched by a steel knife. Common in the USA (Oregon, Idaho), India, Brazil, and South Africa.
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