mineral
Druzy quartz (quartz-lined rock fragment)
Quartz, SiO₂; likely a druzy coating on a host rock
AI-generated identification · may be incorrectTiny, sparkling, colorless-to-cream crystals on an irregular fragment; vitreous luster and no obvious cleavage. Quartz hardness is 7 Mohs, with a trigonal crystal structure and specific gravity near 2.65.
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Physical properties
Tiny, sparkling, colorless-to-cream crystals on an irregular fragment; vitreous luster and no obvious cleavage. Quartz hardness is 7 Mohs, with a trigonal crystal structure and specific gravity near 2.65.
Formation & geological history
Quartz crystals grew from silica-rich fluids in a cavity or fracture, commonly during hydrothermal activity. The specimen’s age and host rock cannot be determined from the image.
Uses & applications
Druzy quartz is used in jewelry, decorative objects, and mineral collections; this small rough fragment has little industrial value.
Geological facts
“Druzy” describes a surface covered with many small crystals rather than a distinct mineral species.
Field identification & locations
Look for a dense, glittering coating of hard, glassy crystals; quartz scratches glass and does not fizz in dilute acid. Druzy quartz occurs worldwide in geodes and mineralized veins.
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