Mineral
Heliotrope (Bloodstone)
Silicon dioxide (SiO2) with inclusions of Hematite or Chlorite
Hardness: 6.5-7 on Mohs scale; Color: Dark green with red to brownish spots; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64
- Hardness
- 6
- Color
- Dark green with red to brownish spots
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Dark green with red to brownish spots; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64
Formation & geological history
Formed at low temperatures through the deposition of silica from groundwater in fractures and cavities of other rocks, primarily volcanic rocks. Its spots are caused by iron oxide inclusions.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads, signet rings), ornamental carvings, and historical talismans. It is the traditional birthstone for March.
Geological facts
In antiquity, it was believed that the red spots represented the blood of Christ. It was historically called 'Heliotrope' from the Greek for 'Sun Turner' because of an ancient belief about its light-reflecting properties in water.
Field identification & locations
Identify by its opaque dark green base and distinct red 'blood-like' splatters; it will scratch glass but cannot be scratched by a steel knife. Common locations include India, Brazil, Australia, and Germany.
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