mineral
Bloodstone
Chalcedony (Variety: Bloodstone / Heliotrope), SiO2
AI-generated identification · may be incorrectHardness: 6.5-7 on the Mohs scale. Color: Dark green with red or brown spots of hematite. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline quartz). Cleavage: None. Specific gravity: 2.58-2.64.
- Hardness
- 6
- Color
- Dark green with red or brown spots of hematite
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on the Mohs scale. Color: Dark green with red or brown spots of hematite. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline quartz). Cleavage: None. Specific gravity: 2.58-2.64.
Formation & geological history
Formed through the deposition of silica-rich hydrothermal solutions in cavities and fractures of existing rocks at relatively low temperatures, often associated with sedimentary or volcanic environments.
Uses & applications
Used in ornamental carvings, signet rings, beads, cabochons, and as a collector's specimen.
Geological facts
Also known as heliotrope, from Greek words meaning 'sun turning', historical folklore suggested the red spots were the blood of Christ fallen on green jasper.
Field identification & locations
Identified by its opaque dark green base color combined with distinct red or orange-brown blood-like inclusions. Found in India, Australia, Brazil, and the USA.
