mineral

Quartz Geode

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White/Clear crystals in a tan/brown host rock; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White/Clear crystals in a tan/brown host rock
Luster: Vitreous (glassy)

Identified July 5, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White/Clear crystals in a tan/brown host rock; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed in cavities within sedimentary or volcanic rocks. Mineral-rich groundwater seeps into hollow spaces (vugs) created by gas bubbles or dissolved organic material, precipitating crystals over thousands of years.

Uses & applications

Primarily used for decorative purposes, educational specimens, metaphysical healing, and mineral collecting.

Geological facts

Geodes are essentially 'rock surprises'; what looks like an ordinary round stone on the outside can contain spectacular crystalline interiors. The term 'geode' comes from the Greek word 'geoides' meaning earth-like.

Field identification & locations

Identify in the field by looking for unusually light, rounded, or lumpy rocks that often have a 'hollow' sound when tapped. Common in desert regions such as Morocco, Mexico, and the Western United States.