mineral

Jasper or Agate Nodule

SiO2

AI-generated identification · may be incorrect

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

Identified September 21, 2026More mineral →

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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.