sedimentary
Red Jasper
Microcrystalline Quartz (SiO2) with Hematite impurities
Hardness: 6.5-7 on Mohs scale; Color: Brick red to brownish-red; Luster: Vitreous to waxy (when wet/polished); Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to waxy (when wet/polished)
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Brick red to brownish-red; Luster: Vitreous to waxy (when wet/polished); Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Jasper forms from the deposition of silica from thermal waters or via the replacement of organic materials. The red color is derived from high concentrations of iron oxide (hematite). It is often found in prehistoric sedimentary beds or as nodules in volcanic rocks.
Uses & applications
Primary use in lapidary work for jewelry, cabochons, and decorative carvings. Historically used for seal stones and ritual tools. Minor uses in high-end construction as decorative inlay.
Geological facts
Red Jasper is known as the 'Stone of Endurance' in metaphysical circles. In ancient times, it was used by warriors for protection and was mentioned in various mythologies as a sacred stone.
Field identification & locations
Identify in the field by its opaque red color and smooth, shell-like (conchoidal) fracture surface. It will scratch glass but cannot be scratched by a steel blade. Commonly found in riverbeds, desert landscapes, and coastal areas globally.
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