mineral

Polished bloodstone (heliotrope), likely

Cryptocrystalline quartz (chalcedony, SiO₂) with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque, polished dark green-gray stone with rusty red-brown patches; vitreous to waxy luster, Mohs hardness 6.5–7, trigonal quartz structure, no visible cleavage. The pictured specimen is consistent with bloodstone, though the image alone cannot confirm its identity.

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Forms as silica-rich chalcedony filling cavities and fractures, with iron oxides producing red markings. It occurs in volcanic rocks and ancient silica deposits; individual geological ages vary by locality.

Uses & applications

Used for cabochons, beads, carvings, and inexpensive jewelry or collecting specimens.

Geological facts

Bloodstone is also called heliotrope; traditional material usually has conspicuous red spots, while this specimen’s subdued markings make identification less certain.

Field identification & locations

Check for a hard, opaque chalcedony body and red iron-oxide patches; common sources include India, Brazil, Australia, and the United States. A hardness or close-up examination would help distinguish it from other jasper or chalcedony.