sedimentary
Heliotrope (Bloodstone)
Silicon Dioxide with Iron Oxide (SiO2)
Hardness: 6.5-7 Mohs; Color: dark green with red spots/streaks; Luster: vitreous to waxy; Structure: Hexagonal (cryptocrystalline); Cleavage: none; SG: 2.6-2.7
- Hardness
- 6
- Color
- dark green with red spots/streaks
- Luster
- vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: dark green with red spots/streaks; Luster: vitreous to waxy; Structure: Hexagonal (cryptocrystalline); Cleavage: none; SG: 2.6-2.7
Formation & geological history
Formed at low temperatures through the precipitation of silica-rich groundwater in cavities of other rocks, often associated with volcanic activity or sedimentary environments.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, rings), ornamental carvings, and widely collected as a healing stone in metaphysical communities.
Geological facts
In the Middle Ages, the red spots were believed to be the blood of Jesus. It is one of the traditional birthstones for March and was famously used in Babylonian seals.
Field identification & locations
Look for a dark green jasper base with distinct red jasper inclusions (iron oxide). Common locations include India, Brazil, Australia, and the western United States.
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