mineral

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to vitreous when polished; Crystal Structure: Hexagonal (Cryptocrystalline); Cleavage: None, exhibits conchoidal fracture; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish-red
Luster: Dull to vitreous when polished

Identified March 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal environments or through the deposition of silica-rich fluids in volcanic rocks and sedimentary deposits. The red color is caused by iron (hematite) inclusions during the solidification process. It can be found in formations ranging from Precambrian to more recent geological eras.

Uses & applications

Commonly used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock tumbling and mineral collecting. Historically used for seals and amulets.

Geological facts

Jasper has been a popular stone since antiquity, mentioned in various historical texts and used by early civilizations for tool-making and adornment. Its name is derived from the Greek word 'iaspis', meaning 'spotted stone'.

Field identification & locations

Identify in the field by its opaque nature (it does not transmit light even at the edges), its deep red color, and its smooth, waxy feel when weathered. It can be found globally, with major deposits in India, Brazil, Madagascar, and the southwestern United States.

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