mineral

Bloodstone

Heliotrope (Chalcedony)

Hardness: 6.5-7 on Mohs scale. Color: Dark green with characteristic red spots (iron oxide). Luster: Vitreous to waxy. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.64.

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

Identified June 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms in shallow waters where low temperatures precipitate silica from circulating waters. The green color is typically caused by chlorite inclusions, while the red spots are hematite (iron oxide).

Uses & applications

Commonly used in lapidary arts for cabochons, beads, and small carvings. Historically used for signet rings and amulets.

Geological facts

Also known historically as heliotrope. Often associated with the birthstone for March in both traditional and modern lists. Legend says the red spots were formed by drops of Christ's blood.

Field identification & locations

Identify by its dark green base color with distinct vivid red spots. Commonly found in India, Brazil, Australia, and the USA. Collectors look for pieces with a solid green background and well-distributed, bright red spots.