mineral
Tumbled jasper (likely brecciated or red jasper)
Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions
AI-generated identification · may be incorrectOpaque reddish-brown, fine-grained, waxy to dull luster, no visible crystals or cleavage; Mohs hardness about 6.5–7, specific gravity roughly 2.5–2.7. The rounded shape indicates tumbling or natural abrasion.
Identified More mineral →
Explore Tumbled jasper (likely brecciated or red jasper) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Opaque reddish-brown, fine-grained, waxy to dull luster, no visible crystals or cleavage; Mohs hardness about 6.5–7, specific gravity roughly 2.5–2.7. The rounded shape indicates tumbling or natural abrasion.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement fine sediment or volcanic material, with iron oxides producing the red-brown color. Formation ages vary widely, commonly Precambrian to younger volcanic or sedimentary settings.
Uses & applications
Used for cabochons, beads, carvings, polished stones, and lapidary displays; occasionally used decoratively in small architectural pieces.
Geological facts
Jasper is a variety of opaque chalcedony or microcrystalline quartz and is often classified by color or pattern, such as red, picture, ocean, or brecciated jasper.
Field identification & locations
Identify it by its opaque body, earthy red-brown color, smooth fine texture, and resistance to scratching by a steel blade. Common sources include India, Brazil, Madagascar, Australia, Mexico, and the western United States; the image alone cannot confirm the exact variety.
