sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs scale), Color: Rusty red to brownish-red, Luster: Dull to waxy, Crystal Structure: Microcrystalline (Trigonal), 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: Dull to waxy, Crystal Structure: Microcrystalline (Trigonal), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica-rich fluids in volcanic or sedimentary rocks; the red color is due to the oxidation of iron (Hematite) during the lithification process. Common in prehistoric deposits over millions of years.
Uses & applications
Used extensively for lapidary work, jewelry (cabochons), ornamentation, and 'healing stones'. Historically used for seal stones and tools in ancient civilizations.
Geological facts
Red Jasper was known as the 'rain bringer' in some Native American cultures. It is a variety of Chalcedony and has been used by humans for thousands of years as jewelry and protective amulets.
Field identification & locations
Identify by its smooth texture, opaque red color, and inability to be scratched by a steel knife. Commonly found in riverbeds and desert regions worldwide, notably in the USA, Brazil, and India. Collectors should look for unique banding or patterns.
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