sedimentary

Red Jasper

Silicon Dioxide (Microcrystalline Quartz) - $SiO_2$

Hardness: 6.5-7 on Mohs scale. Color: Red to reddish-brown due to iron impurities. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline/cryptocrystalline, chalcedony variety). Cleavage: None, exhibits conchoidal fracture. Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Red to reddish-brown due to iron impurities
Luster: Waxy to vitreous

Identified July 31, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed in silica-rich aqueous environments, often through the precipitation of silica in marine sediments or volcanic ash beds, subsequently hardened and colored by iron oxide inclusions over millions of years.

Uses & applications

Commonly used in lapidary work, carved into ornaments, polished as cabochons for jewelry, and collected as a decorative lapidary stone.

Geological facts

Jasper has been used since ancient times for amulets, seals, and weaponry (such as arrowheads). Red jasper is specifically mentioned in various historical and religious texts for its striking color and protective symbolism.

Field identification & locations

Easily identified by its opaque red color, waxy luster, and conchoidal fracture. It does not scratch with a steel knife (hardness > 6). Found worldwide, particularly in deposits associated with iron formations.

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