mineral

Quartz Geode (Druzy Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Translucent white to faint pinkish/orange tint on the exterior shell. Luster: Vitreous (glassy) to crystalline sparkle. Crystal Structure: Trigonal / Hexagonal prismatic micro-crystals forming a druzy cavity. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.

Hardness: 7 on Mohs scale
Luster: Vitreous (glassy) to crystalline sparkle

Identified July 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed when mineral-rich hydrothermal fluids precipitate quartz crystals inside cavities (gas bubbles in volcanic rock or hollows in sedimentary beds) over long periods.

Uses & applications

Popular as decorative collector specimens, crystal healing items, lapidary art, and jewelry accents (druzy stone pendants).

Geological facts

Geodes often appear as plain, unspectacular round rocks from the outside, but cracking them open reveals brilliant hollow cavities lined with glistening quartz crystals.

Field identification & locations

Identified by the distinct hollow cup-like shape lined with tiny, sparkling quartz crystal terminations over a chalcedony or chert matrix. Commonly found in sedimentary deposits in Indiana, Iowa, and Missouri (Keokuk geodes), as well as volcanic regions in Brazil, Uruguay, and Morocco.