mineral

Heliotrope (Bloodstone)

Chalcedony variety Quartz (SiO2) with hematite/chlorite inclusions

Hardness: 6.5 to 7 on the Mohs scale. Color: Dark green with distinctive red or brown spots (due to iron oxide). Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None (conchoidal fracture). Specific gravity: 2.58 to 2.64.

Hardness: 6
Luster: Vitreous to waxy

Identified July 31, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich groundwater in cavities and fractures of rocks at low temperatures, typically in hydrothermal or sedimentary environments.

Uses & applications

Used in ornamental carvings, signet rings, cabochons for jewelry, and as a popular collector's specimen.

Geological facts

Historically known as the 'stone of martyrdom' due to the belief that the red spots were drops of Christ's blood staining green jasper. It is also a traditional birthstone for March.

Field identification & locations

Easily identified by its dark green opaque background contrasted with vibrant red jasper inclusions. Found worldwide, notably in India, Brazil, Australia, and the USA. Collectors look for high contrast and minimal fracturing.

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