Rock Identifier
Bloodstone (also known as Heliotrope) (Silicon Dioxide (SiO2) - variety of Chalcedony) — mineral
mineral

Bloodstone (also known as Heliotrope)

Silicon Dioxide (SiO2) - variety of Chalcedony

Hardness: 6.5–7 on the Mohs scale; Color: Deep dark green with red spots or splashes; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.64

Hardness
6
Color
Deep dark green with red spots or splashes
Luster
Vitreous to waxy
Identified More mineral →

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Physical properties

Hardness: 6.5–7 on the Mohs scale; Color: Deep dark green with red spots or splashes; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.64

Formation & geological history

Formed through the precipitation of silica in volcanic rock cavities or through hydrothermal activity. The red spots are traditionally caused by inclusions of hematite (iron oxide). It is found in deposits dating from various geological periods, often associated with basaltic rocks.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons, beads, rings), as an ornamental stone for carvings, and as a popular specimen for mineral collectors and practitioners of crystal healing.

Geological facts

In the Middle Ages, the red spots were believed to be the blood of Jesus Christ, lending it the name 'Bloodstone.' It was historically known as 'Heliotrope,' which comes from the Greek words for 'sun-turner,' based on the ancient belief that the stone reflected the sun when placed in water.

Field identification & locations

Identify in the field by its characteristic 'forest green' base color and distinct red iron oxide inclusions; it will scratch glass but not be scratched by a steel knife. It is commonly found in India, Brazil, Australia, Germany, and the United States (California). Collectors prioritize stones with vivid, well-distributed red spots.

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