gemstone

Bloodstone (Heliotrope)

Chalcedony variety (Cryptocrystalline Silicon Dioxide, SiO2 with iron oxide inclusions)

AI-generated identification · may be incorrect

Hardness of 6.5–7 on the Mohs scale; vitreous to waxy luster when polished; deep forest green to brownish-black body color mottled with reddish-brown jasper or iron oxide patches and translucent bluish-gray chalcedony zones; trigonal/microcrystalline structure; no cleavage; specific gravity around 2.61.

Identified October 25, 2026More gemstone →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich groundwater at low to moderate temperatures in cavities and fractures of volcanic or sedimentary rocks, incorporating hematite and chlorite/amphibole inclusions that give the red and green hues.

Uses & applications

Popular as a semi-precious gemstone used for cabochons, carvings, polished palm stones, ornamental display items, and historically in signet rings and talismans.

Geological facts

In antiquity and Christian tradition, bloodstone was also known as the 'Martyr's Stone', legendarily believed to have formed where drops of Christ's blood fell upon green earth. It serves as an alternative birthstone for the month of March.

Field identification & locations

Identified by its dense dark green/dark chalcedony matrix speckled or swirled with red-brown iron oxide patches, conchoidal fracture, and quartz hardness. Major commercial localities include India, Brazil, Madagascar, Australia, and the western United States.