Mineral/Semiprecious Stone
Bloodstone
Chalcedony (cryptocrystalline quartz)
Hardness of 6.5-7 on the Mohs scale, opaque green chalcedony with red spots or splashes of iron oxide (hematite), vitreous to waxy luster.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque green chalcedony with red spots or splashes of iron oxide (hematite), vitreous to waxy luster.
Formation & geological history
Formed from silica-rich fluids in cavities and fractures of rocks, often associated with volcanic activity or secondary mineralization.
Uses & applications
Commonly used in jewelry, particularly lapidary items like cabochons, beads, and carved objects. Occasionally used historically in signet rings and amulets.
Geological facts
Bloodstone, also known as heliotrope, was believed in the Middle Ages to represent the blood of Christ. It's one of the traditional birthstones for March.
Field identification & locations
Identifiable by its distinct dark green base color with contrasting red 'blood-like' spots. Found in numerous locations worldwide, notably in India, Brazil, Australia, and parts of the US.
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