mineral

Polished bloodstone (heliotrope)

Chalcedony (microcrystalline quartz, SiO₂) with red iron-oxide inclusions

AI-generated identification · may be incorrect

Typically dark green, opaque chalcedony with vivid red to orange hematite or jasper spots; waxy to vitreous luster, hardness about 6.5–7 Mohs, no cleavage, and specific gravity near 2.6. The rounded, glossy surface indicates a tumbled or polished specimen.

Identified August 14, 2026More mineral →

Explore Polished bloodstone (heliotrope) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures, with iron-bearing minerals producing the red inclusions. It is generally Phanerozoic in age, though the host rocks vary widely.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and inexpensive jewelry; historically associated with seals and decorative objects.

Geological facts

Bloodstone is a variety of chalcedony, not a distinct mineral species. Its red spots are commonly caused by iron oxides, especially hematite, rather than blood-like organic material.

Field identification & locations

Identify it by its opaque deep-green body and contrasting red spots, glassy/waxy polish, and lack of visible quartz crystals; common sources include India, Brazil, Australia, China, and Madagascar. The photograph supports bloodstone, though green jasper or other included chalcedony is possible without testing.