sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
Hardness: 6.5-7 on Mohs scale; Color: Brick red to brownish-red; Luster: Vitreous to greasy; Crystal Structure: Microcrystalline/Trigonal (Chalcedony); Cleavage: None; Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Brick red to brownish-red; Luster: Vitreous to greasy; Crystal Structure: Microcrystalline/Trigonal (Chalcedony); Cleavage: None; Specific Gravity: 2.58-2.91.
Formation & geological history
Formed through the deposition of silica in sedimentary environments or hydrothermal veins. The red color is caused by iron inclusions that permeate the silica during its formation over millions of years.
Uses & applications
Used primarily in lapidary arts, jewelry (cabochons and beads), decorative carvings, and as a metaphysical grounding stone.
Geological facts
In antiquity, Red Jasper was known as the 'rain-bringer' and was used in amulets to protect against exhaustion or bad luck. It is an opaque variety of chalcedony.
Field identification & locations
Identify in the field by its deep red color, opacity (light will not pass through even thin edges), and conchoidal fracture. Commonly found in Brazil, India, USA, and South Africa.
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