mineral

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; deep reddish-brown, opaque, with a vitreous to waxy polish and no visible cleavage. The image shows a shaped, polished piece; exact identification from appearance alone is uncertain.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms as iron-rich silica filling cavities or replacing sediment, then hardens and becomes microcrystalline; jasper deposits occur in rocks of many geological ages.

Uses & applications

Used for beads, cabochons, carvings, and other lapidary objects; also collected as a decorative stone.

Geological facts

Jasper’s distinctive colors and patterns come from impurities and inclusions, especially iron oxides.

Field identification & locations

Look for opacity, red coloration, and hardness sufficient to resist scratching by a steel knife; common sources include India, Brazil, Australia, and the United States.