sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline trigonal (Cryptocrystalline quartz); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish-red
Luster: Vitreous to waxy

Identified April 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica in sedimentary rocks or volcanic ash. The red color is derived from iron inclusions (hematite) during the deposition process. Geologically found in deposits ranging from Precambrian to more recent eras.

Uses & applications

Used primarily in lapidary arts, jewelry (cabochons, beads), decorative carvings, and as a popular collector's stone. Historically used for seals and amulets.

Geological facts

In antiquity, Red Jasper was known as the 'mother of all stones' in some cultures and was used in the Breastplate of the High Priest in Biblical descriptions. Its opacity distinguishes it from its translucent cousin, Carnelian.

Field identification & locations

Identify by its opaque red color, smoothness when tumbled, and inability to be scratched by a steel knife. Commonly found in riverbeds and coastal areas globally, notably in India, Brazil, and the USA.