mineral
Tumbled red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
AI-generated identification · may be incorrectTypically Mohs 6.5–7; opaque reddish-brown, waxy to vitreous luster, very fine-grained cryptocrystalline structure, and no visible cleavage. The pictured piece is polished and rounded by tumbling.
Identified More mineral →
Explore Tumbled red jasper in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Typically Mohs 6.5–7; opaque reddish-brown, waxy to vitreous luster, very fine-grained cryptocrystalline structure, and no visible cleavage. The pictured piece is polished and rounded by tumbling.
Formation & geological history
Forms when silica-rich groundwater replaces or fills cavities and sediments, incorporating iron oxides; deposits range from Precambrian to younger ages. Common sources include India, Madagascar, Brazil, Uruguay, and the western United States.
Uses & applications
Used for beads, cabochons, carvings, worry stones, ornamental objects, and lapidary work; occasionally used as decorative aggregate.
Geological facts
Jasper is a variety of chalcedony or microcrystalline quartz, though its opaque, impure composition distinguishes it from translucent agate. Red coloration usually reflects hematite or other iron minerals.
Field identification & locations
Identify it by its uniform opaque red-brown color, very fine texture, lack of cleavage, and ability to scratch glass; a steel blade generally does not scratch it. Exact identification is uncertain from an image alone.
