mineral

Small druzy quartz geode

Quartz geode; crystalline silica (SiO₂), commonly with chalcedony lining

AI-generated identification · may be incorrect

Typically white to cream, with sparkling drusy quartz crystals lining a hollow cavity; vitreous luster, trigonal crystal structure, Mohs hardness 7, no cleavage, and specific gravity about 2.65. The rough outer shell is commonly chalcedony or weathered volcanic rock.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater deposits chalcedony and quartz crystals inside a gas bubble or cavity in volcanic rock, often over millions of years. Exact age and locality cannot be determined from the image.

Uses & applications

Primarily sold as a decorative or educational specimen and as a small collector piece; larger geodes are used in display, lapidary work, and jewelry.

Geological facts

The hollow interior formed because crystals grew inward from the cavity walls, leaving an open center. Sparkling drusy quartz is a common geode lining.

Field identification & locations

Identify it by its hollow, rounded form and radiating quartz crystals; quartz should scratch glass but not be scratched by a steel knife. Common sources include Brazil, Uruguay, Mexico, Morocco, and the western United States.