mineral
Druzy quartz on matrix
Quartz (SiO₂), microcrystalline crystal coating
AI-generated identification · may be incorrectSmall, pale gray to white crystals with a vitreous sparkle over a dark matrix; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage. The image is low-resolution, so the exact matrix and crystal identity cannot be confirmed.
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Physical properties
Small, pale gray to white crystals with a vitreous sparkle over a dark matrix; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage. The image is low-resolution, so the exact matrix and crystal identity cannot be confirmed.
Formation & geological history
Druzy forms when silica-rich fluids deposit many tiny quartz crystals in a cavity or on a rock surface. This can occur in geodes and veins over a wide range of geological ages.
Uses & applications
Collected as a decorative mineral specimen and sometimes used in jewelry or ornamental pieces; druzy surfaces may be polished or mounted.
Geological facts
A druzy is a texture—a dense layer of tiny crystals—not a distinct mineral species.
Field identification & locations
Look for a sparkling crust of closely packed crystals, commonly lining a cavity; quartz resists scratching by glass. Similar-looking druzy coatings can be other minerals, so testing or a clearer image is needed for certainty.
