sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale), Color: Brown, yellow, and reddish-brown, Luster: Vitreous to dull, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None, Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brown, yellow, and reddish-brown, Luster: Vitreous to dull, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None, Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica from water, often associated with volcanic activity or sedimentary processes. This sample shows typical banding from iron oxidation during formation.
Uses & applications
Used primarily for ornamental purposes, jewelry (cabochons), and as a collector's specimen. Historically used for making tools and seals.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone. It has been a popular gemstone since ancient times.
Field identification & locations
Identify in the field by its conchoidal fracture and extreme hardness (it will scratch glass). Commonly found in riverbeds, deserts, and volcanic regions globally.
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