sedimentary
Red Jasper
Silica (Silicon Dioxide, SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Deep burgundy/brick red; Luster: Vitreous to waxy (when polished); Crystal structure: Microcrystalline/Trigonal; Opaque transparency; Conchoidal fracture visible under surface polish.
- Hardness
- 6
- Color
- Deep burgundy/brick red
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Deep burgundy/brick red; Luster: Vitreous to waxy (when polished); Crystal structure: Microcrystalline/Trigonal; Opaque transparency; Conchoidal fracture visible under surface polish.
Formation & geological history
Jasper forms from the deposition of silica from water-rich environments, often in volcanic or sedimentary processes where iron oxides become trapped in the silica matrix, giving it the red color. These processes can occur over millions of years.
Uses & applications
Commonly used in jewelry (beads, cabochons), carving, ornamental decor, and as tumbled transition stones in crystal collecting. Historically used for seals and amulets.
Geological facts
Red jasper was known in antiquity as the 'Rain Bringer' and was mentioned in various ancient texts for its protective qualities. It is unique among jaspers for its extremely dense, microcrystalline iron-infused structure.
Field identification & locations
Identify in the field by its hardness (will scratch glass), opaque nature even when held to light, and deep red streak if tested. Commonly found in areas with past volcanic activity or sedimentary river beds in Brazil, India, and the USA.
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