Quartz Geode (Druzy)

Physical Properties

Hardness: 7 on Mohs scale; Color: Clear to milky white; Luster: Vitreous to sugary; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Formation & Geological History

Formed via hydrothermal precipitation where silica-rich fluids fill cavities in host rock (typically volcanic or sedimentary). Over long geological periods, crystals grow inward from the cavity walls.

Uses & Applications

Commonly used for home decor, spiritual practices, crystal healing, and as a popular entry-level specimen for mineral collectors.

Geological Facts

This specimen displays a 'druzy' coating, which refers to a layer of tiny crystals that form over a host mineral, giving it a sparkling, sugar-like appearance. Geodes can remain sealed for millions of years.

Field Identification & Locations

Identified by the hollow or concave shape lined with sparkling micro-crystals. Common in desert regions (like Morocco or the US Southwest). Field collectors look for round, bumpy nodules that feel lighter than solid rocks.

Identified on: 5/1/2026

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