gemstone
Bloodstone
Chalcedony quartz variety Heliotrope (SiO2)
Hardness: 6.5 to 7 on the Mohs scale, Color: Dark green with red or brown spots (due to iron oxide inclusions), Luster: Vitreous to waxy, Crystal structure: Trigonal (microcrystalline quartz)
- Hardness
- 6
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale, Color: Dark green with red or brown spots (due to iron oxide inclusions), Luster: Vitreous to waxy, Crystal structure: Trigonal (microcrystalline quartz)
Formation & geological history
Formed through the deposition of silica-rich hydrothermal solutions in cavities and fractures of existing rocks at relatively low temperatures, often associated with sedimentary or volcanic environments.
Uses & applications
Used extensively in jewelry, carved into signet rings, beads, cabochons, and as an ornamental gemstone.
Geological facts
Historically known as the 'martyr's stone' due to ancient legend that the red spots were formed from drops of Christ's blood falling on jasper at the foot of the cross.
Field identification & locations
Identified by its distinctive dark green opaque background interspersed with characteristic red iron oxide inclusions. Found in India, Brazil, Australia, and the USA.
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