sedimentary

Bloodstone Jasper (Heliotrope)

SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz

Hardness: 6.5-7 (Mohs scale); Color: Dark green to blackish-green base with splashes of red jaspor (iron oxide); Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.6 – 2.7

Hardness: 6
Luster: Vitreous to waxy

Identified March 17, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed at low temperatures in igneous or sedimentary rock cavities by the precipitation of silica from groundwater. The red spots are caused by inclusions of hematite (iron oxide). Many deposits date back millions of years to the volcanic eras of the Mesozoic or Cenozoic periods.

Uses & applications

Primarily used for jewelry (bangle bracelets, cabochons, seals), ornamental carvings, and as a birthstone for March. Historically used for amulets and intaglios.

Geological facts

In the Middle Ages, the red spots were believed to be the blood of Christ, giving the stone alleged healing powers. It is often referred to as Heliotrope, from the Greek meaning 'to turn the sun.'

Field identification & locations

Identify by its opaque dark green body and distinctive red flecks. It will scratch glass but not be scratched by a steel knife. Common locations include India (the primary source), Brazil, Australia, Germany, and the United States (California).

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