Sedimentary / Mineral

Red Jasper (Brecchiated Jasper)

Silicon Dioxide (SiO2) with Hematite impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red with white or cream-colored streaks; Luster: Vitreous/Waxy; Crystal Structure: Microcrystalline aggregate (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Luster: Vitreous/Waxy

Identified March 24, 2026More sedimentary / mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from hydrothermal solutions or volcanic ash into sedimentary environments, where iron oxides (hematite) provide the red pigmentation. Often found in Precambrian formations over 500 million years old.

Uses & applications

Commonly used in lapidary arts, jewelry (cabochons and beads), ornamental decor, and as a semi-precious gemstone for decorative carvings.

Geological facts

Jasper has been used by ancient civilizations for seal stones and amulets for millennia. The word 'jasper' stems from the Greek 'iaspis', meaning 'spotted stone.' It is nearly chemically identical to chert and flint.

Field identification & locations

Identify by its opaque nature (light does not pass through), high hardness (will scratch glass), and white quartz veining. Commonly found in riverbeds, desert pavements, and regions with significant volcanic activity or metamorphic belts like South Africa, Brazil, and the USA (Southwest).