mineral

Bloodstone

Heliotrope (Chalcedony)

Hardness: 6.5-7 on Mohs scale. Color: Dark green with red spots. Luster: Vitreous to waxy. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.64.

Hardness: 6
Color: Dark green with red spots
Luster: Vitreous to waxy

Identified June 17, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale. Color: Dark green with red spots. Luster: Vitreous to waxy. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.64.

Formation & geological history

Forms in cavities of rocks or in veins as a secondary mineral from low-temperature silica-rich solutions. Often found in volcanic rocks.

Uses & applications

Primarily used as a gemstone in jewelry, especially for signet rings and carvings. Also collected as a specimen.

Geological facts

The red spots are caused by iron oxide inclusions, usually hematite. In ancient times, it was believed to have magical and healing properties, such as stopping bleeding.

Field identification & locations

Identified by its distinctive dark green color with red, blood-like spots. Commonly found in India, Brazil, Australia, and the USA. Collectors look for pieces with prominent, bright red spots.