mineral
Bloodstone
Chalcedony (Variety Heliotrope), SiO2
Hardness: 6.5-7 on the Mohs scale, Color: Dark green with red or brown spots, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline quartz), Cleavage: None, Specific Gravity: 2.58-2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 on the Mohs scale, Color: Dark green with red or brown spots, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline quartz), Cleavage: None, Specific Gravity: 2.58-2.64
Formation & geological history
Forms in low-temperature hydrothermal veins and cavities in volcanic and sedimentary rocks where silica-rich groundwater deposits microcrystalline quartz, often incorporating iron oxide inclusions that create the red spots.
Uses & applications
Used in jewelry, signet rings, carvings, ornamental objects, and appreciated by mineral collectors.
Geological facts
Historically known as the martyr stone, ancient legends claim the red spots were formed from the blood of Jesus Christ falling on green jasper at the crucifixion.
Field identification & locations
Easily identified by its opaque dark green base color combined with distinct red or orange-brown spots of hematite or jasper. Commonly found in India, Brazil, Australia, and the USA.
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