mineral
Blue druzy quartz cluster
Quartz, SiO₂; blue coloration likely from inclusions or surface treatment
AI-generated identification · may be incorrectGlassy luster with many tiny sparkling quartz crystals (Mohs hardness 7), generally translucent to opaque, with no obvious cleavage and conchoidal fracture. The intense blue color is atypical for natural quartz and may indicate dyeing or mineral inclusions; specific gravity is about 2.65.
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Physical properties
Glassy luster with many tiny sparkling quartz crystals (Mohs hardness 7), generally translucent to opaque, with no obvious cleavage and conchoidal fracture. The intense blue color is atypical for natural quartz and may indicate dyeing or mineral inclusions; specific gravity is about 2.65.
Formation & geological history
Druzy quartz forms when silica-rich groundwater deposits microscopic quartz crystals in cavities, commonly in volcanic rocks or along agate/geode surfaces. The specimen’s precise geological age and locality cannot be determined from the image.
Uses & applications
Used primarily as a decorative and lapidary specimen in cabochons, slabs, jewelry, and mineral collections; it has little industrial value in this form.
Geological facts
“Druzy” describes crystal texture, not a separate mineral. Blue druzy is frequently enhanced by dye, especially when the color is vivid and evenly distributed.
Field identification & locations
Identify it by the dense sugar-like sparkle and quartz hardness; it should scratch glass but not be scratched by a steel knife. Common sources include Brazil, Uruguay, Mexico, and Morocco, though testing is needed to distinguish natural color from treatment.
