mineral
Druzy quartz geode fragment
Quartz, SiO₂, with a coating of fine drusy crystals
AI-generated identification · may be incorrectWhite to pale beige, translucent-to-opaque crystals with a vitreous to sugary sparkle; quartz is trigonal, Mohs hardness 7, with no cleavage and uneven fracture. The image suggests a quartz-lined cavity, though exact identification would require testing.
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Physical properties
White to pale beige, translucent-to-opaque crystals with a vitreous to sugary sparkle; quartz is trigonal, Mohs hardness 7, with no cleavage and uneven fracture. The image suggests a quartz-lined cavity, though exact identification would require testing.
Formation & geological history
Forms when silica-rich fluids deposit quartz crystals on the walls of a cavity in rock; such deposits occur in many geological settings and ages.
Uses & applications
Collected as a mineral specimen and sometimes used in decorative objects or jewelry; larger geodes may be cut or polished.
Geological facts
“Druzy” describes a surface covered in many tiny crystals rather than a distinct mineral species.
Field identification & locations
Look for a glittering coating of closely packed crystals; quartz should scratch glass and resist scratching from a steel knife. Similar-looking calcite is softer and may fizz in dilute acid.
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