mineral

Bloodstone

Heliotrope (a variety of cryptocrystalline Quartz/Chalcedony, primarily SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Dark green with red spots or streaks; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64.

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

Identified July 12, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Dark green with red spots or streaks; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64.

Formation & geological history

Formed in low-temperature environments from silica-rich groundwater circulating through cracks in volcanic rocks. The green color comes from chlorite or hornblende inclusions, while the red spots are hematite/iron oxide.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collectible stone. Historically used for seals and signet rings.

Geological facts

In the Middle Ages, the red spots were believed to be the blood of Christ, leading to the alternative name 'Martyr\'s Stone.' It is also a traditional birthstone for March.

Field identification & locations

Identify by its characteristic forest green body speckled with red dots. Commonly found in India, Brazil, Australia, China, and the United States. Collectors should look for vibrant red spots against a deep green opaque background.