sedimentary

Red Jasper (Tumbled)

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 (Mohs); Color: Deep brick red to brownish-red; Luster: Vitreous to waxy (smooth when tumbled); Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Deep brick red to brownish-red
Luster: Vitreous to waxy (smooth when tumbled)

Identified March 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of fine-grained silica in hydrothermal veins or sedimentary environments, often associated with volcanic activity where iron oxides provide the deep red pigmentation. Ages range widely from Precambrian to Cenozoic.

Uses & applications

Commonly used for ornamental stone, jewelry (cabochons and beads), decorative figurines, and as a popular specimen for metaphysical gemstone collectors.

Geological facts

Jasper was a favorite gem in the ancient world; its name can be traced back in Arabic, Persian, Hebrew, Assyrian, Greek, and Latin. It is also mentioned in biblical texts as a stone of the high priest's breastplate and the foundations of the New Jerusalem.

Field identification & locations

Identify by its opaque nature (unlike Carnelian which is translucent), its hardness (will scratch glass), and its lack of cleavage. Tumbled versions are found in gift shops globally, but raw specimens are common in the desert southwest USA, India, and Brazil.

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