mineral
Bloodstone
Chalcedony (Variety: Bloodstone / Heliotrope), SiO2
AI-generated identification · may be incorrectHardness: 6.5 to 7 on the Mohs scale. Color: Dark green with characteristic red or brown spots of iron oxide (hematite). Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline quartz). Cleavage: None (exhibits conchoidal fracture). Specific gravity: 2.58 to 2.64.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale. Color: Dark green with characteristic red or brown spots of iron oxide (hematite). Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline quartz). Cleavage: None (exhibits conchoidal fracture). Specific gravity: 2.58 to 2.64.
Formation & geological history
Formed through the deposition of silica-rich groundwater in cavities and fractures of existing rocks at low temperatures, typically within sedimentary or volcanic environments.
Uses & applications
Used in ornamental carvings, cabochons, signet rings, and as a collector gemstone.
Geological facts
Historically known as heliotrope, meaning "sun-turner," because ancient writers claimed it turned the sun red when immersed in water.
Field identification & locations
Identified by its opaque dark green base color combined with distinct red spots. Commonly found in India, Brazil, Australia, and the USA.
