sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Ferric Iron inclusions
Hardness: 6.5-7 (Mohs). Color: Opaque brick red to brownish-red. Luster: Vitreous to waxy (when polished). Crystal Structure: Trigonal/Microcrystalline. Cleavage: None (Conchoidal fracture). Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Opaque brick red to brownish-red
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 6.5-7 (Mohs). Color: Opaque brick red to brownish-red. Luster: Vitreous to waxy (when polished). Crystal Structure: Trigonal/Microcrystalline. Cleavage: None (Conchoidal fracture). Specific Gravity: 2.58-2.91.
Formation & geological history
Formed through the deposition of silica from water sources which then undergoes crystallization into a microcrystalline structure. The red color is derived from iron impurities. It is often found in hydrothermal veins or as part of sedimentary deposits.
Uses & applications
Used primarily in lapidary work for cabochons, beads, and carvings. Historically used for ornaments, seals, and as a semi-precious gemstone in jewelry.
Geological facts
In ancient times, Red Jasper was known as a stone of endurance and was often carried by warriors to provide protection and strength. It is a variety of chalcedony.
Field identification & locations
Found worldwide, notably in India, Brazil, Russia, and the USA. Identified by its deep opaque red color and high hardness; it cannot be scratched by a steel pocket knife.
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