mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Pale yellow, translucent white, and brownish crust. Luster: Vitreous to dull. Crystal structure: Trigonal. Cleavage: None.

Hardness: 7 on Mohs scale
Color: Pale yellow, translucent white, and brownish crust
Luster: Vitreous to dull

Identified July 26, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale. Color: Pale yellow, translucent white, and brownish crust. Luster: Vitreous to dull. Crystal structure: Trigonal. Cleavage: None.

Formation & geological history

Formed through hydrothermal deposition of silica-rich fluids inside cavities within volcanic or sedimentary rocks over thousands to millions of years.

Uses & applications

Commonly collected as lapidary rough, display specimens, or used in decorative crafts and metaphysical jewelry.

Geological facts

Geodes are hollow, spherical rocks lined with crystals. When broken open, they reveal sparkling crystal formations, often composed of quartz or agate.

Field identification & locations

Can be identified by its sparkling crystalline texture, chalcedony or quartz core, and rough outer chalcedonic/limonite crust. Commonly found in desert regions, limestone beds, and volcanic ash deposits.