mineral

Quartz Geode

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to dull; Crystal structure: Trigonal (hexagonal prisms); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

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

Identified May 18, 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: White to translucent; Luster: Vitreous to dull; Crystal structure: Trigonal (hexagonal prisms); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed in cavities within volcanic or sedimentary rocks where mineral-rich groundwater deposits silica over thousands of years. Usually found in desert environments or volcanic ash deposits.

Uses & applications

Used extensively in jewelry, decorative ornaments, crystal healing collections, and as educational specimens.

Geological facts

Geodes are like nature's 'surprise eggs'; their drab exterior hides beautiful crystals inside. This specimen appears to be a small 'cracker' geode, common in Moroccan deposits.

Field identification & locations

Identify by looking for a rounded, nodular exterior that feels lighter than a solid rock of the same size. Finding them in the field often involves looking for 'potato-like' rocks in known volcanic or limestone areas.