mineral
Heliotrope (Bloodstone)
Silicon Dioxide (SiO2) with Hematite inclusions
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs); Color: Dark green with red spots or streaks; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.64
- Hardness
- 6
- Color
- Dark green with red spots or streaks
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Dark green with red spots or streaks; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.64
Formation & geological history
Forms in low-temperature silica-rich groundwater environments, typically hydrothermal veins or as nodules in volcanic rocks through precipitation.
Uses & applications
Primarily used in jewelry (cabochons, beads, signet rings) and as a decorative stone or for lapidary art.
Geological facts
The red spots are caused by inclusions of hematite (iron oxide). Historically, it was believed that the red specks were the blood of Christ, leading to its high value in religious artifacts.
Field identification & locations
Identify by its waxy luster, hardness (cannot be scratched by a knife), and distinctive 'blood' red spots on a dark green base. Found frequently in India, Brazil, Australia, and Germany.
