mineral

Quartz Geode fragment

Crystalline Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: white to off-white with yellowish iron staining; Luster: Vitreous to waxy; Hexagonal crystal structure; Conchoidal fracture.

Hardness: 7 on Mohs scale
Color: white to off-white with yellowish iron staining
Luster: Vitreous to waxy

Identified July 9, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: white to off-white with yellowish iron staining; Luster: Vitreous to waxy; Hexagonal crystal structure; Conchoidal fracture.

Formation & geological history

Formed via precipitation of silica-rich hydrothermal fluids or groundwater within cavities of igneous or sedimentary rocks. The hollow center indicates it was part of a larger geode nodule.

Uses & applications

Used primarily for education, hobbyist collecting, and decorative lapidary work. Quartz in general is vital for electronics and glassmaking.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Geodes are unique because they appear like plain rocks on the outside but contain hollow crystal-lined interiors.

Field identification & locations

Identified by its crystal habit inside a cavity, hardness (cannot be scratched by steel), and lack of cleavage. Common in desert environments and limestone regions.