mineral

Red Jasper

Silicon dioxide (SiO2)

Hardness: 6.5-7 (Mohs); Color: Red, often with streaks of brown or gray; Luster: Dull to vitreous; Crystal Structure: Microcrystalline quartz (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Red, often with streaks of brown or gray
Luster: Dull to vitreous

Identified April 6, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins or as a secondary mineral in volcanic rocks. The red color is caused by iron (hematite) inclusions within the silica matrix. Generally found in Precambrian to Tertiary formations.

Uses & applications

Used primarily in lapidary work for cabochons, beads, and stone carvings. Also used as decorative stone in mosaics and as an ornamental gemstone in jewelry.

Geological facts

Jasper is an opaque variety of chalcedony. It has been used for centuries by ancient civilizations for seals, talismans, and as the 'blood of Mother Earth' in indigenous cultures.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel knife), opaque red appearance, and smooth, water-worn texture if found in riverbeds. Common in the Western USA, Brazil, South Africa, and India.