mineral

Quartz Geode

Crystalline Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Colorless to white/cloudy crystals; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal prisms); Cleavage: None/Conchoidal fracture.

Hardness: 7 on Mohs scale
Color: Colorless to white/cloudy crystals
Luster: Vitreous to greasy

Identified July 21, 2026More mineral →

Explore Quartz Geode in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 7 on Mohs scale; Color: Colorless to white/cloudy crystals; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal prisms); Cleavage: None/Conchoidal fracture.

Formation & geological history

Formed when mineral-rich hydrothermal fluids seep into hollow cavities in sedimentary or volcanic rock. Over thousands of years, the cooling fluids deposit layers of silica that crystallize inward.

Uses & applications

Used primarily for home decor, educational displays, meditation/healing practices, and jewelry-making when broken into 'druzy' pieces.

Geological facts

The word 'geode' comes from the Greek word 'Geoides' meaning 'earth-like.' These specimens can range from microscopic to several meters in length, as seen in the Giant Geode of Pulpí in Spain.

Field identification & locations

Identify by looking for a bumpy, round, or egg-shaped exterior that feels lighter than a solid rock of the same size. Commonly found in desert environments or limestone-rich areas like Morocco, Mexico, and the Midwest USA.