sedimentary
Red Jasper
Silicon dioxide / Quartz (SiO2 (+Fe2O3))
Hardness: 6.5-7 (Mohs scale), Color: Dull red to terracotta, Luster: Vitreous to waxy, Crystal structure: Hexagonal (Trigonal), Microcrystalline, Specific gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Dull red to terracotta, Luster: Vitreous to waxy, Crystal structure: Hexagonal (Trigonal), Microcrystalline, Specific gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of fine particles of silica, often as a variety of chalcedony. The red color is caused by the inclusion of iron oxide (hematite) during its sedimentary formation.
Uses & applications
Commonly used as a pocket stone, in jewelry (cabochons, beads), and for lapidary carvings. Historically used for seals and amulets.
Geological facts
Jasper is an opaque variety of chalcedony. In ancient times, it was known as the 'supreme nurturer' and has been found in archaeological sites dating back thousands of years.
Field identification & locations
Identify by its matte to waxy appearance, deep opaque red color, and high hardness (it will scratch glass). Commonly found in riverbeds or as nodules within volcanic and sedimentary rocks worldwide.
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