mineral

Red jasper pebble

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

AI-generated identification · may be incorrect

Typically red to reddish-brown with a dull to waxy luster; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage. The pictured pebble’s exact composition cannot be confirmed from appearance alone.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill or replace rock, with iron oxides providing the color; it may occur in sedimentary or volcanic settings and can be geologically ancient.

Uses & applications

Used for cabochons, beads, carvings, and decorative objects; jasper is also collected as a common ornamental stone.

Geological facts

Jasper is a variety of chalcedony, made of extremely fine quartz crystals; its colors and patterns vary with impurities.

Field identification & locations

Look for an opaque, hard, often red stone that resists scratching by a steel knife; common sources include volcanic and sedimentary deposits worldwide. The rounded shape suggests natural abrasion or tumbling.