sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red due to iron impurities; Luster: Vitreous to waxy (especially when wet or polished); Crystal Structure: Hexagonal (trigonal) microcrystalline silica; Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Brick red to brownish red due to iron impurities
- Luster
- Vitreous to waxy (especially when wet or polished)
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red due to iron impurities; Luster: Vitreous to waxy (especially when wet or polished); Crystal Structure: Hexagonal (trigonal) microcrystalline silica; Specific Gravity: 2.58-2.91.
Formation & geological history
Jasper is an opaque variety of chalcedony that forms through the deposition of silica from water-rich environments. The red coloration is caused by deep-seated iron oxide (hematite) inclusions within the silica matrix, often forming in sedimentary or volcanic environments as nodules or vein fillings over millions of years.
Uses & applications
Widely used for ornamental carvings, gemstones, jewelry (cabochons), and decorative landscaping; historically used for seal stones and lucky charms.
Geological facts
Red Jasper is often referred to as a 'stone of endurance' in metaphysical circles. In ancient times, it was frequently associated with martial deities like Mars due to its blood-red color. It is often found as water-worn pebbles in riverbeds.
Field identification & locations
Identify by its deep red color, opacity (light will not pass through even thin edges), and its ability to scratch glass. It is commonly found in India, Brazil, Egypt, and the Southwestern United States. Collectors should look for unique banding or brecciated patterns.
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