sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide (Fe2O3) inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in cracks, cavities, and sedimentary beds. The red color is derived from high iron content. It is found in deposits ranging from Precambrian to recent geological ages.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and carvings. Historically used for seals and amulets. Also used as decorative stone in mosaics and interior design.
Geological facts
Known as the 'Stone of Endurance' in metaphysical circles. It was one of the stones used in the breastplate of the High Priest in biblical times and was highly prized by the ancient Egyptians.
Field identification & locations
Identify in the field by its opaque deep red color and high hardness (it will scratch glass). It frequently occurs in large veins or as smooth river pebbles. Common locations include Brazil, India, USA (Southwest), and South Africa.
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