sedimentary
Polychrome Jasper
Silicon Dioxide (SiO2) with iron and other mineral inclusions
Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands (purple, gold, red, tan); Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline; Opaque; Specific Gravity: 2.6-2.9
- Hardness
- 6
- Color
- Multi-colored bands (purple, gold, red, tan)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands (purple, gold, red, tan); Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline; Opaque; Specific Gravity: 2.6-2.9
Formation & geological history
Formed through the deposition of silica from volcanic ash or sediment, with colors resulting from varying amounts of iron and manganese during the solidification process. Often found in large formations originating from the Cretaceous period.
Uses & applications
Primarily used for lapidary work, jewelry, home decor, and spiritual/crystal collecting. It is popular for carving into spheres, bowls, and polished points.
Geological facts
Also known as Desert Jasper, it was discovered in Madagascar as recently as 2006 while searching for Ocean Jasper. Its distinct wavy patterns are often compared to landscape paintings.
Field identification & locations
Identify by its matte to waxy shine when polished and its distinct multicolored swirled patterns. Commonly found in the Norbus region of Madagascar. Collectors should look for vibrant color contrast and lack of fractures.
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