mineral

Tumbled red jasper

Jasper, an opaque, iron-bearing variety of microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Smooth, reddish-brown, opaque surface with a subdued polish. Quartz hardness is 6.5–7 Mohs; trigonal crystals are microscopic, with no visible cleavage and a specific gravity near 2.6.

Identified September 27, 2026More mineral →

Explore Tumbled red jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Smooth, reddish-brown, opaque surface with a subdued polish. Quartz hardness is 6.5–7 Mohs; trigonal crystals are microscopic, with no visible cleavage and a specific gravity near 2.6.

Formation & geological history

Jasper forms when silica-rich fluids deposit and cement microcrystalline quartz, often colored by iron oxides; it occurs in many geological ages and settings. The specimen appears mechanically tumbled and polished.

Uses & applications

Used for lapidary jewelry, beads, carvings, and collectible polished stones.

Geological facts

Jasper is a trade name for many opaque, patterned varieties of chalcedony; red coloration commonly comes from hematite or other iron oxides.

Field identification & locations

Identify by its opaque, fine-grained texture, earthy red color, and hardness; it can scratch glass and is commonly found in silica-rich veins and sedimentary deposits worldwide. A small tumbled piece typically sells for about $2–$10.