sedimentary
Red Jasper (possibly Orbicular)
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red with cream/white orbicular spots; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red with cream/white orbicular spots
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red with cream/white orbicular spots; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic or sedimentary environments. The red color comes from iron impurities; the orbital patterns occur as silica crystallizes in radial structures.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and decorative carvings. It is also a popular collector's stone and used in metaphysical practices.
Geological facts
Jasper is an opaque variety of chalcedony. It has been used for millennia; in the ancient world, it was often used for cylinder seals and amulets.
Field identification & locations
Identify in the field by its opacity (it does not transmit light even on thin edges), its hardness (can scratch glass), and its distinctive smooth, waxy feel when polished.
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