mineral

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale. Color: White, pinkish-white interior with a darker host rock exterior. Luster: Vitreous to crystalline. Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.

Hardness: 7 on Mohs scale
Luster: Vitreous to crystalline

Identified July 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids precipitate microcrystalline or macrocrystalline quartz inside hollow cavities (vugs) within sedimentary or volcanic host rocks.

Uses & applications

Used in lapidary work, jewelry making, educational geological displays, and as mineral collection specimens.

Geological facts

Geodes often look like ordinary, non-descript round stones on the outside, but when cracked open, they reveal brilliant interior crystal cavities.

Field identification & locations

Field identification involves checking for a outer weathered matrix enclosing a hollow or crystalline interior cavity. Widely found in basaltic lava flows and limestone formations worldwide.