Rock Identifier
Red Jasper (Jasper (Silicon Dioxide with Iron Oxide impurities), formula: SiO2) — mineral
mineral

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide impurities), formula: SiO2

Hardness: 6.5–7 on Mohs scale; Color: Terracotta-red to brownish-red; Luster: Dull to vitreous (waxy when polished); Crystal Structure: Microcrystalline trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91

Hardness
6
Color
Terracotta-red to brownish-red
Luster
Dull to vitreous (waxy when polished)
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Physical properties

Hardness: 6.5–7 on Mohs scale; Color: Terracotta-red to brownish-red; Luster: Dull to vitreous (waxy when polished); Crystal Structure: Microcrystalline trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91

Formation & geological history

Formed through the deposition of silica from water-rich environments, often near volcanic activity or in sedimentary deposits where mineral-rich waters permeate porous rock. It is typically found in Precambrian to Cenozoic strata.

Uses & applications

Predominantly used as a gemstone for jewelry (cabochons, beads), decorative carvings, and in lapidary arts. Historically used for making tools like scrapers due to its hardness and sharp fracture edges.

Geological facts

Red Jasper has been used for millennia across many cultures; it was known as the 'rain bringer' in Native American traditions and was often used in the seals and amulets of ancient Egyptians.

Field identification & locations

Identify in the field by its opaque nature (it does not transmit light even at the edges), its deep red color caused by hematite inclusions, and its inability to be scratched by a steel knife. Common locations include Brazil, India, USA (Southwest), and South Africa.

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