sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Hardness: 6.5-7 (Mohs scale); Color: Deep red with dark grey or brown streaks; Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline quartz); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Deep red with dark grey or brown streaks
Luster: Vitreous to dull

Identified July 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when fine particulate materials are cemented by silica. The deep red color is caused by high concentrations of iron oxide (hematite) during the sedimentation and mineralization process, often in hydrothermal environments or volcanic regions.

Uses & applications

Used extensively in jewelry for cabochons and beads, as a decorative stone for ornaments, and frequently sold as tumbled stones for crystal healing or mineral collections.

Geological facts

Red Jasper is known as a stone of endurance and stability. It has been used since ancient times in lapidary art; archaeologists have found jasper seals and amulets dating back to the Minoan civilization on Crete and in Ancient Egypt.

Field identification & locations

Identified in the field by its opaque deep red color, characteristic waxy luster when broken, and high hardness that allows it to scratch glass. Commonly found in riverbeds, desert landscapes, and regions with ancient volcanic activity like South Africa, Brazil, and the USA.

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