sedimentary
Jasper (likely Polychrome or Ocean Jasper)
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5–7 (Mohs scale), Color: Multi-colored swirling (pink, grey, cream, green), Luster: Vitreous to dull, Crystal Structure: Microcrystalline/Trigonal, Specific Gravity: 2.58–2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5–7 (Mohs scale), Color: Multi-colored swirling (pink, grey, cream, green), Luster: Vitreous to dull, Crystal Structure: Microcrystalline/Trigonal, Specific Gravity: 2.58–2.91
Formation & geological history
Formed through the deposition of silica from volcanic ash or water-saturated environments during the sedimentation process; typically found in Cretaceous to Jurassic volcanic formations.
Uses & applications
Primarily used in jewelry (beads, cabochons), ornamental carvings, and by mineral collectors for its unique aesthetic patterns.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Polychrome' refers to the multiple colors formed by iron oxides and other mineral inclusions that create 'landscape-like' patterns.
Field identification & locations
Identify in the field by its opacity (it does not let light through even when thin), smooth conchoidal fracture, and inability to be scratched by a steel knife. Common in Madagascar, USA, and Brazil.
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