mineral
Quartz geode
Microcrystalline quartz (chalcedony) lining a cavity with crystalline SiO₂ quartz
AI-generated identification · may be incorrectWhite to tan-brown outer chalcedony rind with clear-to-white druzy crystals; vitreous luster and hexagonal crystal habit. Quartz is Mohs 7, has no cleavage, and specific gravity about 2.65.
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Physical properties
White to tan-brown outer chalcedony rind with clear-to-white druzy crystals; vitreous luster and hexagonal crystal habit. Quartz is Mohs 7, has no cleavage, and specific gravity about 2.65.
Formation & geological history
Forms when silica-rich fluids deposit chalcedony and quartz crystals inside cavities, often in volcanic rocks; the specimen’s age and host rock cannot be determined from the image alone.
Uses & applications
Commonly displayed or collected; geode slices and quartz crystals are also used for ornaments and jewelry.
Geological facts
The crystals grew inward from the cavity walls as mineral-rich water slowly cooled or evaporated.
Field identification & locations
Look for a rounded, tough outer rind enclosing inward-pointing quartz crystals; brown coloration may come from iron oxides. Quartz geodes occur worldwide, especially in volcanic and sedimentary regions.
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