sedimentary
Polychrome Jasper
Silicon Dioxide (SiO2) - Impure Variety of Chalcedony
Hardness: 6.5-7 (Mohs scale), Color: Tan, brown, and red earthy tones, Luster: Vitreous to waxy (when polished), Crystal Structure: Microcrystalline/Trigonal, Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Tan, brown, and red earthy tones, Luster: Vitreous to waxy (when polished), Crystal Structure: Microcrystalline/Trigonal, Specific Gravity: 2.6-2.9
Formation & geological history
Formed from the precipitation of silica from groundwater into volcanic ash or sedimentary beds, often during the Cretaceous period. The distinct colors are created by iron oxides and other mineral impurities during the silicification process.
Uses & applications
Primarily used for lapidary work, jewelry, decorative carvings, and as a popular palm stone for collectors and metaphysical enthusiasts.
Geological facts
Also known as Desert Jasper, it was first discovered in Madagascar around 2006. It is highly valued for its circular, flowing patterns that look like abstract landscapes.
Field identification & locations
Identified in the field by its opaque nature, smooth texture, and desert-like color banding. It is primarily found in Madagascar. Collectors should look for vibrant, multi-colored circular patterns.
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