mineral
Red Jasper (Oolitic Hematite)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish red; Luster: Dull to vitreous; Crystal Structure: Hexagonal (trigonal); Fracture: Conchoidal; Cleavage: None
- Hardness
- 6
- Color
- Brick red to brownish red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish red; Luster: Dull to vitreous; Crystal Structure: Hexagonal (trigonal); Fracture: Conchoidal; Cleavage: None
Formation & geological history
Formed via the accumulation of iron-rich sediments or silica-rich water permeating porous rocks. This specimen likely originates from Banded Iron Formations (BIFs) dating back 1.8 to 3.7 billion years.
Uses & applications
Used primarily as a gemstone for jewelry, carvings, and lapidary work. Historically used for ornaments and seals. Higher iron content versions are mined as iron ore.
Geological facts
Red jasper is known for its deep red color because it contains up to 20% iron oxide (Hematite). In ancient cultures, it was often called 'the blood of Mother Earth'.
Field identification & locations
Identified by its rich red color, opacity, and ability to scratch glass. Found commonly in locations like the Lake Superior region (USA), Brazil, and South Africa.
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