mineral
Heliotrope (Bloodstone)
Chalcedony quartz variety (SiO2) with hematite or jasper inclusions
Hardness: 6.5 to 7 on the Mohs scale. Color: Dark green with distinctive red or brown spots due to iron oxide inclusions. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline quartz/chalcedony). Cleavage: None. Specific gravity: 2.58 to 2.64.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale. Color: Dark green with distinctive red or brown spots due to iron oxide inclusions. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline quartz/chalcedony). Cleavage: None. Specific gravity: 2.58 to 2.64.
Formation & geological history
Formed through the deposition of silica-rich groundwater in cavities and fractures of rocks at relatively low temperatures, typically in hydrothermal or sedimentary environments.
Uses & applications
Used for making cabochons, carved ornamental objects, signet rings, and as a collector's mineral specimen.
Geological facts
Historically known as the 'bloodstone,' ancient folklore believed the red spots were drops of the blood of Jesus Christ, leading to its use in carved artifacts depicting the crucifixion.
Field identification & locations
Easily identified by its dark green opaque base color combined with blood-red spots. Commonly found in India, Brazil, Australia, and the USA.
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