mineral
Quartz geode
Quartz (SiO₂), lining a geode cavity; likely with minor iron-oxide staining
AI-generated identification · may be incorrectWhite to translucent, sparkling drusy crystals with a vitreous luster; quartz is Mohs 7, trigonal crystal system, and lacks cleavage. The tan outer rind is likely host rock, but its composition is not clear from the image.
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Physical properties
White to translucent, sparkling drusy crystals with a vitreous luster; quartz is Mohs 7, trigonal crystal system, and lacks cleavage. The tan outer rind is likely host rock, but its composition is not clear from the image.
Formation & geological history
Silica-rich fluids deposited quartz crystals in a cavity within sedimentary or volcanic host rock. Geode formation spans many geological ages; the specimen’s age and exact host cannot be determined visually.
Uses & applications
Commonly collected and displayed; geode halves and quartz crystals are also used in décor and jewelry.
Geological facts
The fine, densely packed crystals lining the cavity are called drusy quartz.
Field identification & locations
Identify by the hollow, crystal-lined interior, glassy sparkle, and quartz hardness; quartz geodes occur worldwide, including in volcanic and sedimentary regions. Avoid scratching the specimen to test it.
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