mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Clear to white/milky crystals; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Specific Gravity: 2.65

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

Identified July 19, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Clear to white/milky crystals; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Specific Gravity: 2.65

Formation & geological history

Formed as mineral-rich groundwater seeps into hollow cavities in volcanic or sedimentary rock layers. Over long periods, crystals grow inward from the cavity walls.

Uses & applications

Primarily used for decorative purposes, educational specimens, crystal healing collections, and as a popular entry-level mineral for hobbyists.

Geological facts

Geodes appear like ordinary, drab rocks from the outside, but when cracked open, they reveal a hollow interior lined with sparkling druzy crystals. The word 'geode' comes from the Greek word 'Geoides' meaning earth-like.

Field identification & locations

Identify in the field by looking for rounded, lumpy nodules that feel lighter than they look (indicating a hollow center). Common in desert regions with limestone or volcanic history.