sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs scale), Color: Rusty yellow, orange, and brown, Luster: Dull to waxy/greasy, Structure: Microcrystalline quartz, Cleavage: None (conchoidal fracture).
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Rusty yellow, orange, and brown, Luster: Dull to waxy/greasy, Structure: Microcrystalline quartz, Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, typically undergoing low-grade metamorphism or sedimentary compaction over millions of years.
Uses & applications
Used primarily in lapidary arts, jewelry (cabochons and beads), and as a collector's specimen due to its unique patterns and colors.
Geological facts
The name 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone. It is a variety of chalcedony that is made opaque by high concentrations of mineral impurities.
Field identification & locations
Commonly found in river beds, beaches, and desert environments. It can be identified by its hardness (it will scratch glass) and its opaque, smooth surface when wet or polished.
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