sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, clear to white color, vitreous 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, clear to white color, vitreous luster, hexagonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed in cavities in sedimentary or volcanic rocks where silica-rich groundwater percolates through, slowly depositing microscopic quartz crystals over millions of years.
Uses & applications
Used in lapidary arts, specimen collecting, jewelry making, and ornamental decoration.
Geological facts
Geodes appear as ordinary, unassuming rocks on the outside, but cracking them open reveals a stunning, hollow cavity lined with sparkling mineral crystals.
Field identification & locations
Look for rounded, nodular rocks with a bumpy or cauliflower-like exterior texture in limestone or volcanic regions. Collectors often tap them with a hammer to reveal the crystal center.
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