mineral

Bloodstone (Heliotrope)

Silicon Dioxide (SiO2) - Variety of Chalcedony/Jasper

Hardness: 6.5–7 (Mohs scale); Color: Dark green with red speckles (iron oxide/hematite); Luster: Vitreous to waxy; Crystal Structure: Trigonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.63–2.65.

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

Identified March 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed in low-temperature hydrothermal environments where silica-rich groundwater precipitates in cavities of igneous rocks. The red inclusions are most commonly hematite (iron oxide). Found in formations ranging from the Archean to the Cenozoic eras.

Uses & applications

Used primarily in lapidary work for jewelry, cabochons, beads, and ornamental carvings. Historically used for signet rings and religious amulets.

Geological facts

In the Middle Ages, the red spots were believed to be drops of Christ's blood, leading to the alternative name 'Martyr's Stone.' It is the traditional birthstone for March alongside aquamarine.

Field identification & locations

Identify in the field by its deep 'forest green' base color and distinct, opaque blood-red markings. It will scratch glass but not survive a tungsten carbide file. It is commonly found in India, Brazil, Australia, and the USA (California).

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