gemstone

Polished bloodstone (heliotrope)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; opaque to translucent, waxy-to-glassy luster, cryptocrystalline structure, and no visible cleavage. Typically dark green with red to brown hematite or jasper-like spots; this specimen is polished and spherical.

Identified August 22, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or fractures, with iron minerals producing the red inclusions; deposits are commonly Paleozoic to younger, depending on locality. Major sources include India, Brazil, Australia, Madagascar, and the United States.

Uses & applications

Used for cabochons, beads, spheres, carvings, ornaments, and inexpensive jewelry; it is also collected as a decorative gemstone.

Geological facts

Bloodstone is a variety of chalcedony rather than a separate mineral species. The red spots are traditionally associated with drops of blood, giving the material its name.

Field identification & locations

Identify it by its green chalcedony body, contrasting red iron-oxide patches, high polish, and lack of cleavage; it should resist scratching by a steel knife. A typical polished sphere is worth about $10–$60, while larger, vividly patterned examples may bring $100–$300.