mineral
Red Jasper
Silicon dioxide (SiO2) with hematite (Fe2O3) inclusions
Hardness: 6.5-7 on Mohs scale; Color: deep red to brownish-red; Luster: dull to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: none; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- deep red to brownish-red
- Luster
- dull to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: deep red to brownish-red; Luster: dull to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: none; Specific gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine sediment, with its color derived from iron oxide inclusions. Found in veins and as nodules in volcanic rocks globally.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, jewelry, and carvings; also popular as a decorative landscaping stone and as a collected mineral specimen.
Geological facts
Jasper is an opaque variety of chalcedony. It has been used since antiquity; Red Jasper specifically was known as a stone of endurance and was used in ancient Egypt for amulets and jewelry.
Field identification & locations
Identify by its opaque red color, waxy feel when smooth, and conchoidal fracture (curved breaks). Commonly found in riverbeds, deserts, and volcanic regions. It will not be scratched by a steel knife.
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