mineral

Quartz geode / druzy quartz

Quartz, silicon dioxide (SiO₂), microcrystalline to crystalline druse

AI-generated identification · may be incorrect

White to translucent, glassy luster with a sparkling crystalline cavity; Mohs hardness 7, no cleavage, conchoidal fracture, trigonal crystal structure, and specific gravity about 2.65. The rough outer surface may include chalcedony or host rock.

Identified September 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater deposits quartz crystals lining cavities in volcanic rock or sedimentary nodules. Individual geodes may range from relatively young deposits to Paleozoic or younger formations, depending on locality.

Uses & applications

Used as a decorative and lapidary specimen, in jewelry, and for display; ordinary pieces have modest commercial value.

Geological facts

The tiny crystals are called druzy or druse quartz; their sparkle comes from many crystal faces reflecting light. Colorless or white quartz is among Earth’s most abundant minerals.

Field identification & locations

Common in Brazil, Uruguay, Mexico, Morocco, the United States, and Madagascar. Identify it by hardness, sparkling quartz crystals, lack of cleavage, and inability to scratch quartz with a steel nail; acid does not fizz.