mineral
Red jasper (likely)
Jasper, an opaque variety of microcrystalline quartz (SiO₂), colored red by iron oxides
AI-generated identification · may be incorrectThe pictured piece appears red, opaque, and rough; its texture and luster are difficult to judge from the image. Jasper is typically Mohs 6.5–7, with a microcrystalline quartz structure and no cleavage; specific gravity is about 2.6.
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Physical properties
The pictured piece appears red, opaque, and rough; its texture and luster are difficult to judge from the image. Jasper is typically Mohs 6.5–7, with a microcrystalline quartz structure and no cleavage; specific gravity is about 2.6.
Formation & geological history
Jasper forms when silica-rich fluids or sediments are enriched with iron oxides and later harden. It occurs in rocks of many ages, commonly in sedimentary or volcanic settings.
Uses & applications
Used for beads, cabochons, carvings, and decorative objects; it has little industrial use compared with common quartz.
Geological facts
The red color commonly comes from hematite or related iron oxides. Jasper is a trade name for opaque, patterned chalcedony rather than a single narrowly defined mineral species.
Field identification & locations
Red color alone is not diagnostic, but jasper is typically opaque and takes a good polish. It is found worldwide, including India, Brazil, Australia, and the western United States.
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