mineral

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Hardness: 6.5-7 on the Mohs scale. Color: Terracotta red to brownish-red. Luster: Dull to waxy, vitreous when polished. Crystal structure: Microcrystalline (trigonal). Cleavage: None. Specific gravity: 2.58-2.91.

Hardness: 6
Color: Terracotta red to brownish-red
Luster: Dull to waxy, vitreous when polished

Identified July 26, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich fluid in hydrothermal veins or sedimentary environments where fine microcrystalline quartz incorporates iron oxide micro-inclusions during crystallization.

Uses & applications

Popular for lapidary art, polished pebbles, cabochons for jewelry, decorative carvings, and mineral collections.

Geological facts

Red jasper has been used since antiquity for seals, amulets, and ornamental objects. Its distinctive opaque red color is caused by hematite (iron oxide) particles uniformly dispersed throughout the quartz matrix.

Field identification & locations

Can be identified in the field by its hardness (scratches glass), waxy to smooth texture when water-worn, opaque red color, and absence of cleavage with conchoidal fracture. Commonly found in stream beds and alluvial deposits worldwide.

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