mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to translucent
Luster: Vitreous to waxy

Identified May 9, 2026More mineral →

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: White to translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed as secondary minerals in cavities of igneous or sedimentary rocks through precipitation from mineral-rich hydrothermal fluids or groundwater over thousands of years.

Uses & applications

Primarily used for decorative purposes, crystal collecting, metaphysical use, and teaching geological concepts in education.

Geological facts

The word geode comes from the Greek word 'Geoides' meaning earth-like. No two geodes are exactly alike, and they can range from the size of a pea to large enough for a person to stand inside.

Field identification & locations

Identify in the field by looking for rounded, hollow-feeling rocks with a bumpy 'cauliflower' exterior texture. Commonly found in desert regions of the US, Brazil, and Mexico. Use a rock hammer to carefully crack them open.