sedimentary
Jasper and Chalcedony Composite
Silicon Dioxide (SiO2) microcrystalline quartz
Hardness: 6.5-7 on the Mohs scale, Color: Muted purple, yellow, and beige patches, Luster: Waxy to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None, Specific gravity: 2.58-2.66
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 on the Mohs scale, Color: Muted purple, yellow, and beige patches, Luster: Waxy to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None, Specific gravity: 2.58-2.66
Formation & geological history
Forms in sedimentary environments, volcanic cavities, or hydrothermal veins through the deposition of silica-rich fluids over millions of years.
Uses & applications
Used in lapidary arts, ornamental carvings, cabochons, and by mineral collectors.
Geological facts
Jasper is an opaque variety of chalcedony. The varied colors are due to different trace mineral impurities incorporated during the formation process.
Field identification & locations
Found in stream beds, gravel deposits, and rock outcrops globally. Identify by its hard, conchoidal fracture and waxy luster.
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