sedimentary
Agate Nodule
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7. Displays conchoidal fracture with a waxy to vitreous luster and concentric banding in various colors.
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Physical properties
Mohs hardness of 6.5 to 7. Displays conchoidal fracture with a waxy to vitreous luster and concentric banding in various colors.
Formation & geological history
Formed through the deposition of silica-rich groundwater inside cavities of volcanic or sedimentary rocks over millions of years.
Uses & applications
Used extensively for ornamental carvings, jewelry making, lapidary arts, and as collector specimens.
Geological facts
Agate nodules often feature hollow centers lined with sparkling quartz crystals or amethyst points.
Field identification & locations
Identify by its curved weathering rind, smooth conchoidal broken surfaces, and distinct microcrystalline banding; commonly found in volcanic regions worldwide.
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