sedimentary
Jasper (specifically Bloodstone or Heliotrope variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Hardness: 6.5-7 Mohs; Color: Teal-green matrix with red to brownish-red inclusions; Luster: Vitreous to waxy; Structure: Hexagonal (cryptocrystalline); Cleavage: None; SG: 2.6-2.9
- Hardness
- 6
- Color
- Teal-green matrix with red to brownish-red inclusions
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Teal-green matrix with red to brownish-red inclusions; Luster: Vitreous to waxy; Structure: Hexagonal (cryptocrystalline); Cleavage: None; SG: 2.6-2.9
Formation & geological history
Formed when silica-rich hydrothermal fluids or groundwater circulate through volcanic ash or sediment, carrying iron oxides that create the distinct red and green patterns. It is found in igneous environments and derived sedimentary deposits.
Uses & applications
Used primarily as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock tumbling and metaphysical collectors.
Geological facts
In folklore, the red spots were believed to be drops of blood. It was historically used by ancient Babylonians to make seals and amulets to ward off enemies.
Field identification & locations
Identify by its waxy luster, smooth conchoidal fracture, and inability to be scratched by a steel knife. Common in the western United States, India, and Australia in riverbeds and desert washes.
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