mineral
Quartz geode fragment
Quartz (SiO₂), lining a cavity in a silica-rich rock
AI-generated identification · may be incorrectSmall cavity lined with pale honey-colored, translucent quartz crystals; vitreous luster and hexagonal crystal structure. Quartz has Mohs hardness 7 and no cleavage; the brown outer material may be iron-stained host rock.
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Physical properties
Small cavity lined with pale honey-colored, translucent quartz crystals; vitreous luster and hexagonal crystal structure. Quartz has Mohs hardness 7 and no cleavage; the brown outer material may be iron-stained host rock.
Formation & geological history
Likely formed as silica-rich fluids deposited quartz crystals inside a rock cavity; the image does not reveal its geological age or precise host rock.
Uses & applications
Small geode pieces are mainly collected or used for display and craft work; larger specimens may be cut into ornaments.
Geological facts
Geodes form when crystals grow inward from the walls of a hollow cavity, sometimes over long periods.
Field identification & locations
Look for a rough outer rind surrounding a hollow or crystal-lined interior; quartz is hard enough to scratch glass. Geodes occur in many volcanic and sedimentary regions worldwide.
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