mineral
Quartz geode or quartz-bearing rock
Quartz (SiO₂), likely in a chalcedony- or basalt-hosted cavity
AI-generated identification · may be incorrectWhite to pale blue-gray translucent quartz with drusy crystals and a darker fine-grained host; vitreous luster, hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The bluish color may result from inclusions or thin chalcedony layers.
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Physical properties
White to pale blue-gray translucent quartz with drusy crystals and a darker fine-grained host; vitreous luster, hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The bluish color may result from inclusions or thin chalcedony layers.
Formation & geological history
Silica-rich groundwater deposited quartz and chalcedony in a cavity or fracture, commonly within volcanic rock; crystal growth may occur over thousands to millions of years. The exact geological age and host rock cannot be determined from the image.
Uses & applications
Used for mineral collecting, lapidary pieces, décor, and occasionally jewelry; quartz is also important in glass, electronics, abrasives, and construction aggregate.
Geological facts
The sparkling surface is drusy quartz—many tiny crystal points coating a cavity. Quartz is one of Earth’s most abundant minerals and forms in igneous, sedimentary, and metamorphic environments.
Field identification & locations
Identify it by glassy luster, very high hardness, lack of cleavage, and crystals that can scratch ordinary glass. Common sources include Brazil, Uruguay, Mexico, Morocco, and volcanic districts worldwide.
