mineral
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs), Color: Dark green with red spots/streaks, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Dark green with red spots/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 when silica-rich groundwater precipitates in cavities of volcanic rocks. The dark green is caused by chlorite or actinolite, and red spots are inclusions of iron oxide (hematite).
Uses & applications
Primarily used in jewelry, cabochons, carvings, and as a popular collector's mineral. Historically used in signet rings and amulets.
Geological facts
In the Middle Ages, the red spots were believed to be the blood of Christ. It is an alternative birthstone for March and is often called 'Heliotrope', from the Greek words for 'Sun-Turner'.
Field identification & locations
Identify by its characteristic forest green body color with distinct red inclusions of hematite that resemble blood spatters. Common sources include India, Brazil, Madagascar, and Australia.
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