sedimentary
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Dark green with red speckles; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.64
- Hardness
- 6
- Color
- Dark green with red speckles
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Dark green with red speckles; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.64
Formation & geological history
Formed through the precipitation of silica-rich groundwater at low temperatures in the cavities and veins of heavy rocks. The red spots are caused by inclusions of hematite (iron oxide).
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a birthstone (March). Historically used in signet rings and amulets.
Geological facts
In Christian legend, it was said that the red spots were formed by the blood of Christ falling on green jasper at the foot of the cross. It was also known in antiquity as 'Heliotrope', meaning 'Sun Turner' in Greek.
Field identification & locations
Identify in the field by its waxy luster, conchoidal fracture, and characteristic 'blood-like' red spatters on a forest-green base. Major sources include India, Brazil, Australia, and the United States (California).
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