mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Hardness of 7 on Mohs scale, vitreous to dull luster, hexagonal crystal structure, white to clear crystalline core with a brownish-yellow weathered matrix coating, no cleavage, specific gravity of approximately 2.65.
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Physical properties
Hardness of 7 on Mohs scale, vitreous to dull luster, hexagonal crystal structure, white to clear crystalline core with a brownish-yellow weathered matrix coating, no cleavage, specific gravity of approximately 2.65.
Formation & geological history
Formed in cavities of igneous or sedimentary rocks through hydrothermal precipitation of silica-rich solutions over geological time scales, commonly millions of years.
Uses & applications
Popular for lapidary work, mineral collecting, education, decorative display pieces, and metaphysical practices.
Geological facts
Geodes are hollow, spherical rock cavities lined with crystals. When broken open, they reveal fully formed crystalline structures inside that grew inward toward the center.
Field identification & locations
Can be identified in the field by its rough outer host rock matrix revealing sharp, glass-like quartz crystals inside. Commonly found in stream beds, volcanic ash beds, and limestone formations globally.
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