mineral
Quartz Geode or Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale; color ranges from white, clear, to yellowish-brown due to iron oxide staining; vitreous to sugary luster; hexagonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale; color ranges from white, clear, to yellowish-brown due to iron oxide staining; vitreous to sugary luster; hexagonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.
Formation & geological history
Formed in cavities of host rocks (often limestone or volcanic rock) through the precipitation of silica-rich groundwater over millions of years.
Uses & applications
Used in mineral collecting, decorative display pieces, and occasionally for lapidary purposes or jewelry.
Geological facts
Druzy quartz refers to tiny, microscopic crystals that form on or within a rock, creating a sugar-like sparkling effect. Iron staining (limonite or goethite) commonly gives these specimens their warm yellowish-orange coloration.
Field identification & locations
Can be identified by its characteristic sugary sparkle (druzy), hardness that scratches glass, and reaction-free surface with acid compared to carbonate rocks. Commonly found in regions with significant hydrothermal activity or sedimentary basins worldwide.
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