mineral
Bloodstone
Heliotrope (Chalcedony with inclusions of Hematite) - SiO2
Hardness: 6.5-7 (Mohs scale), Color: Dark green with red/brown spots, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Specific Gravity: 2.58-2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Dark green with red/brown spots, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Specific Gravity: 2.58-2.64
Formation & geological history
Formed in volcanic rocks and through hydrothermal processes where silica-rich fluids deposit microcrystalline quartz in cavities. Red spots are usually inclusions of hematite or iron oxides.
Uses & applications
Primarily used in jewelry for cabochons and beads, as well as for decorative carvings, seals, and as a birthstone for March.
Geological facts
In the Middle Ages, the red spots were believed to be the blood of Christ. It was historically called 'Heliotrope' from the Greek for 'turner of the sun' because it was thought to reflect the sun's rays.
Field identification & locations
Identify by the characteristic 'blood' spots against a dark green base. Common sources include India, Brazil, Australia, and South Africa. Collectors look for high contrast between green and red.
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