mineral

Bloodstone

Heliotrope (Silicon dioxide, SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs). Color: Dark green with red spots (iron oxide/jasperiods). Luster: Vitreous to waxy. Crystal system: Trigonal (cryptocrystalline). Opaque.

Hardness: 6
Color: Dark green with red spots (iron oxide/jasperiods)
Luster: Vitreous to waxy

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs). Color: Dark green with red spots (iron oxide/jasperiods). Luster: Vitreous to waxy. Crystal system: Trigonal (cryptocrystalline). Opaque.

Formation & geological history

Formed at shallow depths and low temperatures through the precipitation of silica from groundwater in fractures and cavities of volcanic rocks.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a collector's gemstone. Historically used for signet rings.

Geological facts

Also known as Heliotrope, the red spots are caused by inclusions of hematite or jasper. In ancient times, it was believed to have the power to stop bleeding and influence the weather.

Field identification & locations

Identify by its characteristic forest-green base and blood-red inclusions. Commonly found in India, Brazil, Australia, and the USA. It will not be scratched by a steel knife.