mineral

Quartz Druzy Geode

Silicon Dioxide (SiO2) - Crystalline Variety

Hardness: 7 on the Mohs scale. Color: Clear to white crystals with a yellowish/tan outer rind. Luster: Vitreous (glassy) on crystal faces. Crystal structure: Hexagonal/Trigonal. Cleavage: None (conchoidal fracture). Specific Gravity: Approximately 2.65.

Hardness: 7 on the Mohs scale
Color: Clear to white crystals with a yellowish/tan outer rind
Luster: Vitreous (glassy) on crystal faces

Identified March 30, 2026More mineral →

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Physical properties

Formation & geological history

Formed through precipitation from silica-rich hydrothermal fluids within a cavity (vug) or gas bubble in volcanic or sedimentary rock. This process can happen over thousands to millions of years as minerals crystallize on the inner walls of the host rock.

Uses & applications

Commonly used in small jewelry pieces, as pocket stones, or for crystal healing and metaphysical collections. Larger, high-quality geodes are used as decorative home accents and museum displays.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. When crystals grow in a tight cluster that looks like sugar coating a surface, it is known as 'druzy' quartz. Many small geodes like this are found in riverbeds after being weathered out of their original rock formations.

Field identification & locations

Identify in the field by looking for rounded, lumpy stones that feel lighter than they look (indicating a hollow center) or by seeing sparkle within a broken nodule. Commonly found in areas with volcanic history or ancient seabed deposits like those in Iowa (Keokuk), Morocco, and Brazil.

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