sedimentary
Red Jasper
Red Jasper (SiO2 with Hematite impurities)
Hardness: 6.5-7 (Mohs); Color: Deep red/orange-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.6-2.9
- Hardness
- 6
- Color
- Deep red/orange-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep red/orange-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.6-2.9
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, typically undergoing low-grade metamorphism or hydrothermal processes. Often found in Precambrian formations.
Uses & applications
Used extensively for lapidary work, jewelry (beads, cabochons), ornamental carvings, and as a popular specimen for rock tumbling and collecting.
Geological facts
Red Jasper has been used since antiquity for seals and amulets. It is often called the 'stone of endurance' in metaphysical circles and owes its vibrant color to high iron content.
Field identification & locations
Identify by its reddish-brown color, opaque appearance, and high hardness—it will scratch glass and won't be scratched by a steel knife. Commonly found on beaches and in riverbeds as water-worn pebbles.
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