mineral
Quartz Crystal Geode / Druzy Cluster
Silicon Dioxide (SiO2)
Mohs hardness of 7, vitreous to sugary luster, hexagonal/trigonal crystal system, white to reddish-orange iron-stained tones with sparkling druzy crystal points, conchoidal fracture.
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Physical properties
Mohs hardness of 7, vitreous to sugary luster, hexagonal/trigonal crystal system, white to reddish-orange iron-stained tones with sparkling druzy crystal points, conchoidal fracture.
Formation & geological history
Formed via hydrothermal precipitation in cavities of volcanic host rocks or sedimentary geodes where silica-rich fluids cooled and crystallized over extended geological periods.
Uses & applications
Widely collected as display specimens, used in decorative lapidary work, metaphysical practices, and gemstone crafting.
Geological facts
Druzy refers to a coating of tiny crystals forming over a rock surface or cavity. The reddish-brown tint is usually due to microscopic iron oxide inclusions like hematite or goethite.
Field identification & locations
Identified by sparkling crystal faces lining a hollow or undulating stone matrix that scratches glass easily (Mohs 7). Commonly found in Brazil, Uruguay, Morocco, and the USA.
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