sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7.0 (Mohs). Color: Opaque brick red to maroon. Luster: Vitreous to dull. Crystal system: Hexagonal (microcrystalline). Cleavage: None, exhibits conchoidal fracture.
- Hardness
- 6
- Color
- Opaque brick red to maroon
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7.0 (Mohs). Color: Opaque brick red to maroon. Luster: Vitreous to dull. Crystal system: Hexagonal (microcrystalline). Cleavage: None, exhibits conchoidal fracture.
Formation & geological history
Formed from microcrystalline fibrous quartz. The red color is derived from iron (hematite) inclusions within the silica structure during hydrothermal processes or sedimentary diagenesis.
Uses & applications
Commonly used as a gemstone, in lapidary work for carvings/cabochons, and as a decorative stone in jewelry and interior design. Historically used for seals and amulets.
Geological facts
Red Jasper is known as a stone of endurance and was reportedly used in the breastplate of the High Priest in biblical times. It is the red variety of Chalcedony.
Field identification & locations
Identify by its deep red color and waxy to smooth texture when broken. It will not scratch easily with a knife. Found globally, especially in river beds or areas with volcanic activity.
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