sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale). Color: Opaque red. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None, conchoidal fracture. Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Opaque red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale). Color: Opaque red. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None, conchoidal fracture. Specific gravity: 2.58-2.91.
Formation & geological history
Forms when silica-rich fluids permeate through volcanic ash or sediment, often associated with iron-rich environments where the oxidation of iron provides the red color. Typically found in ancient sedimentary deposits or as cobbles in riverbeds.
Uses & applications
Used extensively in jewelry (cabochons, beads), decorative carvings, and as a component of terrazzo floors. Also popular in metaphysical practices and crystal collecting.
Geological facts
Red Jasper is known as the 'stone of endurance' and was used in ancient times for talismans and by warriors for protection. It is a variety of chalcedony that contains up to 20 percent foreign materials which determine its color.
Field identification & locations
Identify by its deep red color and high hardness (it will scratch glass). Look for it in areas with high volcanic or sedimentary activity. Collectors should look for smooth, dense pieces without prominent fractures.
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