sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Rusty red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Microcrystalline trigonal (Quartz), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58–2.91.
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Rusty red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Microcrystalline trigonal (Quartz), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58–2.91.
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Its red color comes from high iron inclusions (Hematite). It can be found in formations ranging from the Archean to the present.
Uses & applications
Commonly used for decorative lapidary work, cabochons for jewelry, pocket stones, and architectural inlay. Historically used for seals and talismans.
Geological facts
In antiquity, Red Jasper was known as the 'rain bringer' and was mentioned in various cultural myths as a stone of protection. It is an opaque variety of chalcedony.
Field identification & locations
Identified in the field by its opacity (it will not let light through even on thin edges), its streak (usually colorless or white), and its smooth, waxy feel when tumbled. Found globally, specifically in the USA, Brazil, and India.
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