sedimentary
Red jasper (likely tumbled jasper/chert)
Microcrystalline quartz, SiO₂, colored red by iron oxides; exact identification from the photo is uncertain.
AI-generated identification · may be incorrectOpaque, smooth and polished, orange-red with pale inclusions; quartz has Mohs hardness 7, vitreous to dull luster, and no cleavage. The image does not reveal crystal structure or confirm specific gravity.
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Physical properties
Opaque, smooth and polished, orange-red with pale inclusions; quartz has Mohs hardness 7, vitreous to dull luster, and no cleavage. The image does not reveal crystal structure or confirm specific gravity.
Formation & geological history
Jasper forms when silica-rich sediment or volcanic material becomes silicified; iron oxides impart the red color. Formation age and original setting cannot be determined from appearance alone.
Uses & applications
Used for beads, cabochons, ornaments, and lapidary pieces; jasper is also collected as a decorative stone.
Geological facts
Jasper is an opaque variety of chalcedony, itself microcrystalline quartz; commercial names often describe color or pattern rather than a distinct mineral species.
Field identification & locations
Look for opacity, red iron-oxide coloration, and hardness sufficient to resist scratching by a steel knife. Jasper/chert occurs worldwide in sedimentary and volcanic terrains; this specimen appears tumbled or polished.
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