mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Clear to milky white. Luster: Vitreous (glassy). Crystal Structure: Hexagonal (trigonal) prisms. Cleavage: Indistinct/Conchoidal fracture. Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Clear to milky white
Luster: Vitreous (glassy)

Identified July 1, 2026More mineral →

Explore Quartz Geode Fragment 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: Clear to milky white. Luster: Vitreous (glassy). Crystal Structure: Hexagonal (trigonal) prisms. Cleavage: Indistinct/Conchoidal fracture. Specific Gravity: 2.65.

Formation & geological history

Formed by the precipitation of mineral-rich water within cavities or bubbles (vesicles) in volcanic rock or sedimentary limestone. These cavities slowly fill with crystals over millions of years.

Uses & applications

Primarily used as decorative display pieces, for geological education, and in crystal healing practices. Large clear specimens may be used for carving or industrial glass manufacturing.

Geological facts

Geodes appear like ordinary rocks on the outside but contain hollow cavities lined with crystals. The word 'geode' comes from the Greek word 'geodes' meaning earth-like.

Field identification & locations

Identify in the field by looking for rounded, hollow-sounding nodules that are lighter than solid rocks of the same size. Commonly found in desert regions of the SW United States, Brazil, and Mexico. Collectors should look for unbroken specimens for higher value.