sedimentary
Jasper with Iron Inclusions
Silicon Dioxide (SiO2) with impure Iron Oxides
Hardness: 6.5-7 (Mohs). Color: Ocher, tan, brown with dark dendritic or spotty inclusions. Luster: Dull to waxy. Crystal Structure: Microcrystalline (Trigonal). Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Ocher, tan, brown with dark dendritic or spotty inclusions
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs). Color: Ocher, tan, brown with dark dendritic or spotty inclusions. Luster: Dull to waxy. Crystal Structure: Microcrystalline (Trigonal). Cleavage: None (conchoidal fracture).
Formation & geological history
Formed from silica-rich fluids depositing in environments like riverbeds or through hydrothermal processes. The distinctive patterns were created by iron or manganese oxide infiltration over millions of years.
Uses & applications
Used primarily for lapidary work, jewelry (cabs), aquarium decor, and as pocket stones or meditation tools for collectors.
Geological facts
Jasper is a variety of chalcedony. The name 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone'. It is extremely durable and has been used for seals and amulets since ancient times.
Field identification & locations
Identify by its hardness (cannot be scratched by a steel knife) and smooth, water-worn exterior. Commonly found in riverbeds, gravel pits, and desert washes. This specimen shows a 'picture jasper' quality due to the dark landscape-like inclusions.
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