mineral
Red jasper
Jasper, an opaque, microcrystalline variety of quartz (SiO₂), colored chiefly by iron oxides
AI-generated identification · may be incorrectTypically red-brown with an earthy to vitreous luster; Mohs hardness about 6.5–7 and no cleavage. The pictured piece appears rough and fractured; color alone cannot confirm jasper.
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Physical properties
Typically red-brown with an earthy to vitreous luster; Mohs hardness about 6.5–7 and no cleavage. The pictured piece appears rough and fractured; color alone cannot confirm jasper.
Formation & geological history
Forms when silica-rich fluids or sediments become impregnated with iron oxides and silicified. Jasper occurs in rocks of many geological ages and settings.
Uses & applications
Used for cabochons, beads, carvings, and decorative objects; also collected as a common ornamental stone.
Geological facts
Jasper is a broad trade name for opaque, patterned chalcedony rather than a distinct mineral species.
Field identification & locations
Look for opacity, fine-grained texture, and hardness sufficient to scratch glass; red color may also occur in other iron-rich rocks. Found worldwide, including India, Brazil, Australia, and the United States.
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Igneous Pegmatite
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Epidote
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metamorphic
Gypsum (variety Selenite or Alabaster)
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Mineral