sedimentary
Agate in Host Rock
Silicon dioxide (SiO2) within a volcanic matrix
AI-generated identification · may be incorrectMohs hardness of 7, vitreous to waxy luster, microcrystalline quartz structure, and variable banded colors.
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Physical properties
Mohs hardness of 7, vitreous to waxy luster, microcrystalline quartz structure, and variable banded colors.
Formation & geological history
Formed via the deposition of silica-rich groundwater within cavities of volcanic rocks over millions of years.
Uses & applications
Used primarily in ornamental carvings, jewelry, lapidary art, and geological collecting.
Geological facts
Agate banding records ancient rhythmic fluctuations in chemical composition and fluid pressure within geological cavities.
Field identification & locations
Identify by its hardness, conchoidal fracture, and waxy luster; commonly found in vesicular volcanic rocks worldwide.
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