sedimentary
Red Jasper
Jasper (Silica/Microcrystalline Quartz with Hematite inclusions), SiO2
Hardness: 6.5-7 (Mohs scale); Color: Deep brick red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep brick red to brownish-red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Deep brick red to brownish-red; Luster: Dull to vitreous; 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 or volcanic ash, which then solidifies into microcrystalline quartz. The deep red color is caused by the inclusion of iron oxide (hematite) during the formation process, often occurring in volcanic or hydrothermal environments.
Uses & applications
Used extensively in jewelry fabrication (cabochons, beads), decorative lapidary arts, metaphysical collecting, and historically as a material for seals and ornamentation.
Geological facts
Red jasper was known as a 'warrior stone' in ancient times, often used in the hilts of swords and amulets for protection. It is an opaque variety of chalcedony that can contain up to 20% foreign materials, which determines its unique patterns and colors.
Field identification & locations
Identify in the field by its opaque red color, smooth waxy feel when wet, and characteristic conchoidal (shell-like) fracture edges that are sharp like glass. Commonly found in riverbeds, desert regions, and areas with ancient volcanic activity such as India, Brazil, and the Southwestern USA.
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