mineral

Quartz Geode (Cracked)

Crystalline Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: white to translucent; Luster: vitreous (glassy) to dull; Crystal structure: hexagonal/trigonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: white to translucent
Luster: vitreous (glassy) to dull

Identified June 29, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: white to translucent; Luster: vitreous (glassy) to dull; Crystal structure: hexagonal/trigonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed primarily as secondary hydrothermal deposits filling cavities (vugs) in volcanic or sedimentary rocks. Over millions of years, mineral-rich groundwater seeps into these cavities, slowly precipitating silica which crystallizes into quartz.

Uses & applications

Commonly used for educational purposes, museum and private collections, decorative home decor, and sometimes in New Age practices as healing crystals. High-purity quartz is used in electronics and glass-making.

Geological facts

Geodes often look like ordinary, bumpy rocks from the outside; their inner crystalline wonder is only revealed when cracked open. Some geodes can contain amethyst, citrine, or chalcedony instead of common white quartz.

Field identification & locations

Identify in the field by looking for round, bumpy, or nodules of rock that feel lighter than they look (indicating a hollow center). Commonly found in desert regions of the US, Brazil, and Uruguay.