Quartz Geode

Physical Properties

Hardness: 7 (Mohs scale); Color: Clear to white; Luster: Vitreous; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct; Specific Gravity: 2.65

Formation & Geological History

Formed by the precipitation of mineral-rich water within cavities of igneous or sedimentary rocks, often over millions of years as hydrothermal fluids deposit silica layers.

Uses & Applications

Primarily used as decorative display specimens, for lapidary work, jewelry, and in metaphysical collecting.

Geological Facts

Geodes are essentially hollow rocks with secret crystalline interiors. The term geode is derived from the Greek word 'Geoides' which means 'earth-like'.

Field Identification & Locations

Identify in the field by looking for rounded, bumpy, lighter-than-average rocks that sound hollow when tapped. Common in desert regions with volcanic history or limestone beds.

Identified on: 5/14/2026

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