mineral
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with inclusions of Hematite or Iron oxide
Hardness: 6.5-7 on Mohs scale; Color: Dark green with red spots; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
- Hardness
- 6
- Color
- Dark green with red spots
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Dark green with red spots; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
Formation & geological history
Forms at low temperatures through the deposition of silica from groundwater in cavities of other rocks, often volcanic. The red spots are caused by inclusions of iron oxides such as Jasper or Hematite.
Uses & applications
Primarily used as a gemstone for jewelry, carvings, and as a collector's specimen. It is also historically used for talismans and amulets.
Geological facts
Legend says the red spots represent the blood of Christ. It was used in ancient times as a healing stone and to stop bleeding. It is the traditional birthstone for March.
Field identification & locations
Identify by its characteristic forest-green chalcedony base with distinct red or brownish spots. It is commonly found in India, Brazil, Australia, and the USA. Collectors look for vibrant red contrasts against deep green.
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