sedimentary

Bloodstone

Heliotrope (Quartz SiO2 with Iron Oxide inclusions)

AI-generated identification · may be incorrect

Hardness: 6.5-7.0 (Mohs scale); Color: Dark green with red spots (iron oxide); Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58–2.64

Hardness: 6
Color: Dark green with red spots (iron oxide)
Luster: Vitreous to waxy

Identified July 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed at low temperatures through the precipitation of silica from groundwater in cavities of other rocks. The red spots are caused by inclusions of hematite (iron oxide). Most specimens date back to the Cretaceous period.

Uses & applications

Used primarily in jewelry (beads, cabochons, seals), ornamental carvings, and as a popular collector's stone. Historically used for amulets and signet rings.

Geological facts

Also known as Heliotrope, which means 'sun turner' in Greek. In the Middle Ages, the red spots were believed to be the blood of Christ, leading to its common name and significant religious value in Christian art.

Field identification & locations

Identified by its dark forest-green base color and distinct 'splatters' of red iron oxide. While it is predominantly found in India, significant deposits also exist in Brazil, China, Australia, and the USA. Collectors look for a high contrast between the green and red.