mineral

Tumbled bloodstone (heliotrope), probable

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

AI-generated identification · may be incorrect

Dark green to nearly black, opaque, with rusty-red hematite/jasper patches and a polished waxy luster; hardness about 6.5–7 Mohs, no cleavage, cryptocrystalline structure, specific gravity ~2.6. The image is consistent with bloodstone, though similar green jasper or nephrite is possible.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or fractures, with iron oxides producing red inclusions; commonly associated with volcanic rocks, generally formed from Paleozoic to younger deposits. Major sources include India, Brazil, Australia, Madagascar, and the United States.

Uses & applications

Used for cabochons, beads, carvings, worry stones, and ornamental objects; historically used for seals and signet rings. Lower-grade material is inexpensive but attractive polished pieces are collectible.

Geological facts

Bloodstone is a variety of chalcedony rather than a separate mineral species. Its red spots are traditionally linked to blood, inspiring historical religious legends.

Field identification & locations

Identify by testing for hardness, examining the uniformly fine texture, and distinguishing it from glass or dyed stone; it should not show obvious grains or cleavage. Estimated value: $3–$20 for a small tumbled stone, or $20–$100+ for fine patterned cabochons.