sedimentary
Green Jasper (Heliotrope / Bloodstone variety)
Silicon Dioxide (SiO₂)
Hardness: 6.5-7 (Mohs scale). Color: Deep opaque forest green, occasionally with red spots or dark inclusions. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal) microcrystalline. Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale). Color: Deep opaque forest green, occasionally with red spots or dark inclusions. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal) microcrystalline. Specific Gravity: 2.58-2.91.
Formation & geological history
Formed through the deposition of silica from water at low temperatures or within volcanic rock cavities. It is an impure variety of silica that can form in almost any geological age, often associated with hydrothermal activity or groundwater percolation through sedimentary layers.
Uses & applications
Used primarily for ornamental jewelry (cabochons, beads), decorative carvings, and as a popular ‘tumbled stone’ for crystal collecting and metaphysical purposes. Historically used for signet rings and amulets.
Geological facts
Jasper is of the chalcedony family. While this specimen is deep green, the presence of red iron oxide spots would classify it specifically as 'Bloodstone'. In the Middle Ages, the red spots were legendary as being the blood of Christ, leading to its high historical value in religious icons.
Field identification & locations
Identify in the field by its opacity (true jasper does not let light through except at thin edges), its smooth waxy fracture, and its inability to be scratched by a steel knife. Commonly found in India, Brazil, Australia, and the western United States.
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