mineral

Quartz Geode

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness of 7 on Mohs scale, clear to translucent white color, vitreous luster, trigonal crystal system lining a hollow interior cavity, no distinct cleavage, specific gravity around 2.65.

Identified July 27, 2026More mineral →

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Physical properties

Hardness of 7 on Mohs scale, clear to translucent white color, vitreous luster, trigonal crystal system lining a hollow interior cavity, no distinct cleavage, specific gravity around 2.65.

Formation & geological history

Formed inside gas bubbles in volcanic rocks or cavities in sedimentary rocks when silica-rich hydrothermal fluids precipitate quartz crystals over thousands to millions of years.

Uses & applications

Popular among mineral collectors, used in home decor, lapidary arts, metaphysical practices, and educational displays.

Geological facts

Geodes look like plain, non-descript round rocks from the outside, but cracking them open reveals a sparkling hollow cavern lined with crystals.

Field identification & locations

Identified by its rough chalcedonic or limestone shell surrounding a hollow, crystal-lined interior. Commonly found in Morocco, Brazil, Uruguay, and the Midwestern United States.