Sedimentary/Mineral
Jasper
Microcrystalline Quartz (SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Multicolored (browns, tans, cream, dark spots), Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Multicolored (browns, tans, cream, dark spots), Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None
Formation & geological history
Forms from silica-rich fluids in sedimentary environments or volcanic ash deposits, often replacing original organic material or filling cavities.
Uses & applications
Commonly used in jewelry making (cabochons, pendants), ornamental carvings, and lapidary work.
Geological facts
Jasper is an opaque variety of chalcedony. The complex patterns in this piece suggest it might be a brecciated or picture jasper variety.
Field identification & locations
Identified by its opacity, hardness (can scratch glass), and intricate banding or patterns. Found worldwide.
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