mineral
Bloodstone
Heliotrope (Cryptocrystalline Quartz, SiO2)
Hardness: 6.5–7 Mohs. Color: Deep green with red inclusions of hematite. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline). Cleavage: None. Specific gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Deep green with red inclusions of hematite
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 Mohs. Color: Deep green with red inclusions of hematite. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline). Cleavage: None. Specific gravity: 2.58–2.91.
Formation & geological history
Formed at shallow depths through precipitation from silica-rich groundwater in cavities of other rocks. The red spots are caused by iron oxide (hematite) impurities.
Uses & applications
Used primarily in lapidary arts for jewelry, carvings, and as a birthstone for March. Historically used for signet rings and amulets.
Geological facts
Also known as Heliotrope, which means 'sun turner.' In ancient times, it was believed that when placed in water, the reflection of the sun would turn red. It was also once used to stop bleeding in medieval folklore.
Field identification & locations
Look for a dark green, opaque chalcedony body with distinct red specks. It is common in riverbeds or as tumbled stones from India, Brazil, Australia, and the USA.
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