sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
Hardness: 6.5-7 on Mohs scale; Color: Opaque brick red to brownish-red; Luster: Vitreous to greasy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Opaque brick red to brownish-red
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Opaque brick red to brownish-red; Luster: Vitreous to greasy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water or volcanic ash, occurring in hydrothermally altered environments or as nodules in sedimentary rocks. Its red color is derived from high hematite (iron) content.
Uses & applications
Primarily used for lapidary work, jewelry (beads, cabochons), ornamental carvings, and as a popular stone for mineral collectors and metaphysical practitioners.
Geological facts
Red Jasper has been used since antiquity; it was known as the 'rain-bringer' in Native American cultures and was featured in the Breastplate of Aaron in biblical times.
Field identification & locations
Identify in the field by its solid opaque red color and smooth, conchoidal fracture. It is commonly found in India, Brazil, USA (Southwest), and South Africa. It will not scratch with a pocket knife.
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