mineral
Bloodstone
Heliotrope (Cryptocrystalline Quartz, SiO2)
Hardness: 6.5-7 on Mohs scale. Color: Dark green with red to reddish-brown flecks or patches. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline). Cleavage: None. Specific gravity: 2.61.
- Hardness
- 6
- Color
- Dark green with red to reddish-brown flecks or patches
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Dark green with red to reddish-brown flecks or patches. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline). Cleavage: None. Specific gravity: 2.61.
Formation & geological history
Forms at relatively low temperatures through the deposition of silica-rich fluids in fractures and cavities of volcanic and sedimentary rocks. Green color is caused by inclusions of chlorite or amphibole needles, while the red spots are inclusions of iron oxide (hematite).
Uses & applications
Widely used as a gemstone in jewelry, especially for cabochons, beads, and carved signet rings. Also popular as a tumbled pocket stone or decorative item.
Geological facts
Historically known as Heliotrope, meaning 'sun-turner' in ancient Greek, due to the belief that it reflected the rays of the setting sun. In Christian tradition of the Middle Ages, the red spots were believed to represent the blood of Jesus Christ fallen upon a green jasper at the foot of the cross.
Field identification & locations
Identified by its characteristic dark forest-green base color accented by distinct red or reddish-brown hematite specks. Prominent deposits are found in India, Brazil, Australia, Madagascar, South Africa, and the United States (California).
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