sedimentary
Red Jasper
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5–7 (Mohs scale), Color: Red to brownish-red due to iron inclusions, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None, Fracture: Conchoidal, Specific Gravity: 2.58–2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5–7 (Mohs scale), Color: Red to brownish-red due to iron inclusions, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None, Fracture: Conchoidal, Specific Gravity: 2.58–2.91
Formation & geological history
Formed through the deposition of silica from mineral springs or hydrothermal veins. The red color is caused by the inclusion of fine iron particles and impurities during the silica precipitation process.
Uses & applications
Commonly used for lapidary work, decorative carvings, cabochons for jewelry, pocket stones, and architectural ornamentation.
Geological facts
Red jasper was known in antiquity as a 'warrior stone.' It has been used for millennia for seals, amulets, and ring stones. It is an opaque variety of chalcedony.
Field identification & locations
Identify in the field by its intense red color, extreme hardness (it will scratch glass), and opaque nature (light will not pass through it unlike agate). It often displays a waxy or smooth feel on broken surfaces.
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