mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Colorless to white/translucent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Colorless to white/translucent
Luster: Vitreous (glassy)

Identified April 24, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Colorless to white/translucent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed in cavities (vugs) within igneous or sedimentary rocks. Soluble silicates seep into the hollow space and crystallize over thousands of years as the solution cools or evaporates.

Uses & applications

Used primarily for home decor, educational specimens, metaphysical collecting, and jewelry lapidary. High-purity quartz is also used in electronics and glass manufacturing.

Geological facts

Geodes are essentially 'rock bubbles' that are plain on the outside but contain hollow crystal cavities inside. The name 'geode' comes from the Greek word 'Geoides' meaning 'earth-like'.

Field identification & locations

Identify by its sparkling, sugary crystal face (druzy) and a curved, dull outer rind. Commonly found in desert regions or limestone-rich areas. Collectors look for unbroken nodules that feel lighter than they look, indicating a hollow center.