sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: opaque red, reddish-brown; Luster: vitreous to waxy; Crystal Structure: microscopic hexagonal (trigonal); Cleavage: none; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- opaque red, reddish-brown
- Luster
- vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: opaque red, reddish-brown; Luster: vitreous to waxy; Crystal Structure: microscopic hexagonal (trigonal); Cleavage: none; Specific Gravity: 2.58-2.91
Formation & geological history
Formed from silica-rich fluids depositing in cracks or cavities of other rocks, or through the consolidation of microcrystalline quartz and hematite. Often found in hydrothermal environments or as river-worn pebbles.
Uses & applications
Used primarily for jewelry (cabochons, beads), decorative carvings, lapidary arts, and as a healing stone in metaphysical practices.
Geological facts
Jasper’s red color comes from high concentrations of iron. It is one of the traditional birthstones for March and has been used for seals and amulets since ancient Mesopotamian civilizations.
Field identification & locations
Identify by its deep red opaque color and inability to be scratched by a steel knife. It is common in riverbeds, desert pavements, and coastal areas globally, especially in Oregon, India, and Brazil.
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