mineral
Jasper or Agate Nodule
SiO2
AI-generated identification · may be incorrectHardness 6.5-7 on Mohs scale, opaque to semi-translucent, variable colors (red, brown, tan, grey), dull to waxy luster in rough form, cryptocrystalline structure
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Physical properties
Hardness 6.5-7 on Mohs scale, opaque to semi-translucent, variable colors (red, brown, tan, grey), dull to waxy luster in rough form, cryptocrystalline structure
Formation & geological history
Forms in cavities of volcanic rocks or as nodules in sedimentary formations through the deposition of silica-rich fluids
Uses & applications
Collecting, lapidary arts (tumbling, cabochons), ornamental purposes
Geological facts
Jasper is an opaque variety of chalcedony, often containing up to 20% foreign material which accounts for its color and opacity.
Field identification & locations
Identify by its waxy feel, hardness (cannot be scratched by steel), and conchoidal fracture. Commonly found in riverbeds, deserts, and areas with past volcanic activity.
