sedimentary

Bloodstone (Heliotrope)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

AI-generated identification · may be incorrect

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

Identified July 12, 2026More sedimentary →

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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.