sedimentary

Red Jasper

Silicon dioxide (SiO2) with hematite impurities

Hardness: 6.5-7 on Mohs scale; Color: Terracotta red to deep brick red; Luster: Dull to waxy; Crystal structure: Microcrystalline/Cryptocrystalline (Trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Terracotta red to deep brick red
Luster: Dull to waxy

Identified April 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from mineral springs or hydrothermal veins. The red color is caused by iron (hematite) inclusions incorporated during formation in various geological periods, often associated with volcanic ash or sedimentary environments.

Uses & applications

Used in lapidary work for jewelry, cabochons, and beads. Also used for ornamental carvings, pocket stones for collectors, and historical use in seals and architecture.

Geological facts

Jasper has been a preferred gemstone since antiquity; it is mentioned in several ancient texts and was used in the Minoan civilization to create seals. It is often referred to as the 'Supreme Nurturer' in metaphysical circles.

Field identification & locations

Identify in the field by its opaque nature (unlike translucent carnelian), its high hardness (it will scratch glass), and its distinct earthy red color. It is common in riverbeds and desert environments where silica-rich stones aggregate.

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