sedimentary

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Microcrystalline/Trigonal (Cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91.

Hardness: 6

Identified April 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Its red color is derived from high iron content. It can be found in sedimentary deposits or as water-worn pebbles in stream beds.

Uses & applications

Used primarily in jewelry (beads, cabochons), lapidary arts, decorative ornaments, and historically as a tool material due to its sharp conchoidal fracture.

Geological facts

Jasper has been used as a gemstone since antiquity; it was mentioned in the Bible and used in ancient Minoan seals. Its vibrant color is due to the presence of hematite inclusions.

Field identification & locations

Identify in the field by its intense red color, extreme hardness (it will scratch glass), and smooth, shell-like (conchoidal) fracture lines. Often found alongside riverbeds or in areas with old volcanic activity.