mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 on Mohs scale; Color: reddish-brown, brick red; Luster: dull to vitreous/waxy when polished; Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz); Cleavage: none; Fracture: conchoidal.
- Hardness
- 6
- Color
- reddish-brown, brick red
- Luster
- dull to vitreous/waxy when polished
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: reddish-brown, brick red; Luster: dull to vitreous/waxy when polished; Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz); Cleavage: none; Fracture: conchoidal.
Formation & geological history
Formed when fine particulate silica precipitates in volcanic sediments, hydrothermal veins, or sedimentary environments, acquiring its distinct red color from iron oxide (hematite) inclusions.
Uses & applications
Popular for lapidary work, tumbled stones, ornamental carvings, beads, cabochons, and gemstone collections.
Geological facts
Red jasper was used as a sacred stone by ancient Egyptians, Greeks, and Native Americans. It is a dense, opaque variety of chalcedony.
Field identification & locations
Identified by its distinctive opaque red color, hardness that resists steel scratching, smooth to slightly waxy texture, and conchoidal fracture. Commonly found in riverbeds and desert environments worldwide.
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