mineral
Quartz geode
Quartz (SiO₂), likely in a chalcedony or other silica-rich host rind
AI-generated identification · may be incorrectWhite to colorless crystals line a small cavity within a gray, rough outer rind. Quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure; the visible crystals are too small to assess cleavage reliably.
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Physical properties
White to colorless crystals line a small cavity within a gray, rough outer rind. Quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure; the visible crystals are too small to assess cleavage reliably.
Formation & geological history
Formed as silica-bearing fluids deposited quartz crystals inside a cavity in rock; geodes commonly develop in volcanic or sedimentary settings over geological time. The exact age and host rock cannot be determined from the image.
Uses & applications
Primarily a display or collecting specimen; geodes are also used in decorative objects and jewelry settings.
Geological facts
Geodes form when minerals crystallize inward from the walls of a hollow rock cavity.
Field identification & locations
Identify by the hollow interior lined with sparkling quartz and a contrasting solid rind; similar geodes occur worldwide. The gray rind and white crystals are not enough to determine a specific locality.
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