sedimentary
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 Mohs; Color: Dark green with red speckles; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None; Opaque.
- Hardness
- 6
- Color
- Dark green with red speckles
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Dark green with red speckles; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None; Opaque.
Formation & geological history
Formed at low temperatures through the precipitation of silica from groundwater in the fractures and cavities of other rocks. The red spots are caused by inclusions of hematite (iron oxide).
Uses & applications
Primarily used for lapidary purposes, such as polished spheres, cabochons for jewelry (rings and pendants), and carvings. Historically used for amulets and signet rings.
Geological facts
Also known as Heliotrope, which comes from Greek roots meaning 'sun turner.' In medieval times, the red spots were mythologically associated with the blood of Christ, leading to its popularity in religious carvings.
Field identification & locations
Identify by its characteristic forest-green chalcedony base and distinct, scattered red drops of hematite. Major sources include India, Brazil, Australia, and Madagascar.
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